Tìm X
a) 5 x (4 + 6 x X) = 290 b) X x 3,7 + X x 6,3 = 120 c) (15 x 24 – X) : 0,25 = 100 : 1/4 |
d) 128 x X – 12 x X – 16 x X = 5208000
e) 5 x X + 3,75 x X + 1,25 x X = 20
g) (84,6 – 2 x X) : 3,02 = 5,1
Tìm X
a) 5 x (4 + 6 x X) = 290 b) X x 3,7 + X x 6,3 = 120 c) (15 x 24 – X) : 0,25 = 100 : 1/4 |
d) 128 x X – 12 x X – 16 x X = 5208000
e) 5 x X + 3,75 x X + 1,25 x X = 20
g) (84,6 – 2 x X) : 3,02 = 5,1
x * 3,7 + x : 6,3 = 120
( 15 * 24 - x ) : 0,25 = 100 : \(\frac{1}{4}\)
5 * x + 3,75 * x + 1,25 * x = 20
bạn nào giúp mình đi mik sẽ tik cho các bạn nha!!!!!!!!!
x.3,7+x.6,3=120b,x.3,7+x.6,3=120
x(3,7+6,3)=120x(3,7+6,3)=120
10x=12010x=120
x=120:10x=120:10
x=12(tm)
(15×24-x):0.25=100 : 1/4
(15×24-x):0.25 = 400
(15x24-x) = 100
360-x =100
x=260
(8.75+1.25 +5+1) x X=20
16 x X=20
X=20 :16
X=1.25
Tìm x a) 5 x (4 + 6 x X) = 290 b) X x 3,7 + X x 6,3 = 120 c) (15 x 24 – X) : 0,25 = 100 : 1/4 Trả lời từng các bước tìm x cho mình nhé (ai đúng mình tick.) |
b) X x 3,7 + X x 6,3 = 120 |
X x ( 3,7 + 6,3 ) = 120
X x 10 = 120
X = 120 : 10
X = 12
Vậy X = 12
a 48
b
c
tự làm đừng hỏi
a) 5 x (4 + 6 x X) = 290 |
4 + 6 x X = 290 : 5
4 + 6 x X = 58
6 x X = 58 - 4
6 x X = 54
X = 54 : 6
X = 9
Vậy X = 9
9 - 3 x ( X - 9 ) = 6
4 + 6 x ( X + 1 ) 70
\(\dfrac{X}{13}+\dfrac{15}{26}=\dfrac{46}{52}\)
\(\dfrac{11}{14}-\dfrac{3}{X}=\dfrac{5}{14}\)
5 x ( 3 + 7 x X ) = 40
X x 6 + 12 : 3 = 120
X x 3,7 + X x 6,3 = 120
( 15 x 24 - X ) : 0,25 = 100 : \(\dfrac{1}{4}\)
71 + 65 x 4 = \(\dfrac{X+140}{X}\)+ 260
( X +1 ) + ( X + 4 ) + ( x + 7 ) + ...... + (X + 28 ) = 155
đây là bài tìm X
Giải:
\(9-3\times\left(x-9\right)=6\)
\(3\times\left(x-9\right)=9-6\)
\(3\times\left(x-9\right)=3\)
\(x-9=3:3\)
\(x-9=1\)
\(x=1+9\)
\(x=10\)
\(4+6\times\left(x+1\right)=70\)
\(6\times\left(x+1\right)=70-4\)
\(6\times\left(x+1\right)=66\)
\(x+1=66:6\)
\(x+1=11\)
\(x=11-1\)
\(x=10\)
\(\dfrac{x}{13}+\dfrac{15}{26}=\dfrac{46}{52}\)
\(\dfrac{x}{13}=\dfrac{23}{26}-\dfrac{15}{26}\)
\(\dfrac{x}{13}=\dfrac{4}{13}\)
\(\Rightarrow x=4\)
\(\dfrac{11}{14}-\dfrac{3}{x}=\dfrac{5}{14}\)
\(\dfrac{3}{x}=\dfrac{11}{14}-\dfrac{5}{14}\)
\(\dfrac{3}{x}=\dfrac{3}{7}\)
\(\Rightarrow x=7\)
\(5\times\left(3+7\times x\right)=40\)
\(3+7\times x=40:5\)
\(3+7\times x=8\)
\(7\times x=8-3\)
\(7\times x=5\)
\(x=5:7\)
\(x=\dfrac{5}{7}\)
\(x\times6+12:3=120\)
\(x\times6+4=120\)
\(x\times6=120-4\)
\(x\times6=116\)
\(x=116:6\)
\(x=\dfrac{58}{3}\)
\(x\times3,7+x\times6,3=120\)
\(x\times\left(3,7+6,3\right)=120\)
\(x\times10=120\)
\(x=120:10\)
\(x=12\)
\(\left(15\times24-x\right):0,25=100:\dfrac{1}{4}\)
\(\left(360-x\right):0,25=400\)
\(360-x=400.0,25\)
\(360-x=100\)
\(x=360-100\)
\(x=260\)
\(71+65\times4=\dfrac{x+140}{x}+260\)
\(\left(x+140\right):x+260=71+260\)
\(x:x+140:x+260=331\)
\(1+140:x+260=331\)
\(140:x=331-1-260\)
\(140:x=70\)
\(x=140:70\)
\(x=2\)
\(\left(x+1\right)+\left(x+4\right)+\left(x+7\right)+...+\left(x+28\right)=155\)
\(10\times x+\left(1+4+7+...+28\right)=155\)
Số số hạng \(\left(1+4+7+...+28\right)\) :
\(\left(28-1\right):3+1=10\)
Tổng dãy \(\left(1+4+7+...+28\right)\) :
\(\left(1+28\right).10:2=145\)
\(\Rightarrow10\times x+145=155\)
\(10\times x=155-145\)
\(10\times x=10\)
\(x=10:10\)
\(x=1\)
Đều theo cách lớp 5 nha em!
Bài 1 tính nhanh ( đầy đủ ). ( dấu chấm là dấu nhân )
(84,6-2. x ):3,02=5,1
(15.24-x):0,25=100:0,25
128.x-12.x-16.x=5200
5.x+3,75.x+1,25.x=20
x.3,7+x.6,3=360:120
x.23-6.23+x.69=230
(x+1).(x+2)=72
(x+2).16.x=160.x
\(\left(84,6-2\cdot x\right):3,02=5,1\)
\(\Rightarrow84,6-2\cdot x=15,402\)
\(\Rightarrow2\cdot x=69,198\)
\(\Rightarrow x=69,198:2\)
\(\Rightarrow x=34,599\)
_____________
\(\left(15\cdot24-x\right):0,25=100:0,25\)
\(\Rightarrow\left(360-x\right):0,25=400\)
\(\Rightarrow360-x=100\)
\(\Rightarrow x-360-100\)
\(\Rightarrow x=260\)
______________
\(128\cdot x-12\cdot x-16\cdot x=5200\)
\(\Rightarrow x\cdot\left(128-12-16\right)=5200\)
\(\Rightarrow x\cdot100=5200\)
\(\Rightarrow x=5200:100\)
\(\Rightarrow x=52\)
__________________
\(5\cdot x+3,75\cdot x+1,25\cdot x=20\)
\(\Rightarrow x\cdot\left(5+3,75+1,25\right)=20\)
\(\Rightarrow10\cdot x=20\)
\(\Rightarrow x=20:10\)
\(\Rightarrow x=2\)
\(x\cdot3,7+x\cdot6,3=360:120\)
\(\Rightarrow x\cdot\left(3,7+6,3\right)=3\)
\(\Rightarrow x\cdot10=3\)
\(\Rightarrow x=\dfrac{3}{10}\)
__________________
\(x\cdot23-6\cdot23+x\cdot69=320\)
\(\Rightarrow x\cdot\left(23+69\right)=320+6\cdot23\)
\(\Rightarrow x\cdot92=458\)
\(\Rightarrow x=458:92\)
\(\Rightarrow x=\dfrac{229}{46}\)
___________________
\(\left(x+1\right)\left(x+2\right)=72\)
\(\Rightarrow x^2+2x+x+2=72\)
\(\Rightarrow x^2+3x+2=72\)
\(\Rightarrow x^2+3x+2-72=0\)
\(\Rightarrow x^2+3x-70=0\)
\(\Rightarrow x^2+10x-7x-70=0\)
\(\Rightarrow\left(x-7\right)\left(x+10\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=7\\x=-10\end{matrix}\right.\)
___________________
\(\left(x+2\right)\cdot16\cdot x=160x\)
\(\Rightarrow16x^2+32x=160x\)
\(\Rightarrow16x^2+32x-160x=0\)
\(\Rightarrow16x^2-128x=0\)
\(\Rightarrow16x\left(x-8\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=0\\x=8\end{matrix}\right.\)
Đổi:
f.x.23-6.23+x.69=230
=>23.(x-6+3x)=230
=>4x-6=10
=>4x=10+6
=>4x=16
=>x=4
h.(x+2).16.x=160.x
=>(16x+32).x = 160x
=>16x^2 + 32x = 160x
=>16x^2 = 128x
=>16x^2 - 128x=0
=>x(16x-128)=0
=>x=0 hoặc 16x-128=0
+)x=0=>x=0
+)16x-128=0
=>16x=128
=>x=8
Dạng Toán tính nhanh
1. Tính nhanh
a) 6,28 x 18,24 + 18,24 x 3,72 b) 35,7 x 99 + 35 + 0,7 c) 17,34 x 99 + 18 – 0,66 | d) 0,9 x 95 + 1,8 x2 + 0,9 e) 0,25 x 611,7 x 40 g) 37,2 x 101 – 37 – 0,2 |
2. Tính nhanh
a) (100 + 67) x 67 + (200 – 33) x 33 b) 45,651 x 73 + 45,651 x 20 + 45,651 x 7 c) 14,2 x 30 + 14,2 x 57 + 14,2 x 13 d) 72 + 36 x2 + 24 x 3 + 18 x 4 + 12 x 6 + 168 e) (8,27 + 7,16 + 9,333) – (7,27 + 6,16 + 8,33) | g) 1,5 + 2,5 + 3,5 + 4,5 +… + 8,5 h) 7,63 x 12,47 + 12,47 x 2,37 i) 37,2 x 101 – 37 – 0,2 k) 112,37 x 4,29 – 4,29 x 12,37 l) 17,4 x 52 + 57 x 17,4 – 17,4 x 9 |
3. Tính nhanh
a) 12,7 + 12,7 + 12,7 + 12,7 x 8 – 12,7 b) 81,3 x 99 + 82 – 0,7 c) (100 + 42) x 42 + (200 – 58) x 58 d) 17,8 x 99 + 17 + 0,8 | e) 103,7 x 101 – 103 – 0,7 g) 124 x 76 + 12 x 248 h) 12,48 x 3,47 – 3,47 x 2,48 i) 128 x 68 + 16 x 256 |
4. Tính nhanh
a) 12,48 x 3,47 – 3,47 x 2,48 b) 128 x 68 + 16 x 256 c) (7,29 + 9,34 + 8,27) – (7,34 + 6,27 + 5,29) d) 45,7 x 101 – 45,7 | e) 95,72 x 3,57 + 3,57 x 4,28 g) (200 - 58) x 58 + (100 + 42) x 42 h) 50 – 51 + 40 – 41 + 30 – 31 + 60 i) 28 + 62 x a x ( a x 1 – a : 1) + 28 x 8 + 28 |
Dạng Toán Tìm X
1. Tìm X
a) 5 x (4 + 6 x X) = 290 b) X x 3,7 + X x 6,3 = 120 c) (15 x 24 – X) : 0,25 = 100 : 1/4 | d) 128 x X – 12 x X – 16 x X = 5208000 e) 5 x X + 3,75 x X + 1,25 x X = 20 g) (84,6 – 2 x X) : 3,02 = 5,1 |
2. Tìm X
a) 7,2 : 2,4 x X = 4,5 b) 9,15 x X + 2,85 x X = 48 c) (X x 3 + 4) : 5 = 8 d) (15 x 28 – X) : 2/5 = 200 : 0,4
| e) X x 4,8 + 5,2 x X = 160 g) 7 x (8 + 2 x X) = 210 h) X x 5,6 + 4,4 x X =130 i) (X – 12) x 17 : 11 = 51 k) 9,15 x X + 2,85 x X = 48 |
3. Tìm X
a) (X x 7 + 8) : 5 = 10 b) (X + 5) x 19 : 13 = 57 c) 4 x (36 – 4 x X) = 64 d) 7,6 : 1,9 x X = 3,2 e) (X : 2 + 50) : 5 = 12 | g) 280 : (7 + 3 x X) = 4 h) 6 x (28 – 8 x X) = 72 i) (X – 15 ) x 3 : 12 = 6 k) (X : 4 + 6) x 7 = 70 l) 5 x (7 + 3 x X) = 140 |
4. Tìm X
a) X x 17,7 – 7,7 x X = 177 b) 9 x (12 – 2 x X) = 54 c) X x 3,9 + X x 0,1 = 16 d) 1,23 : X – 0,45 : X = 1,5 e) (X - 1/3) x 5/3 = 14/27 - 3/9 l) (12 x 15 – X) x 1/4 = 120 x 1/4 | g) 17/5 : X = 34/5 : 4/3 h) X : 4/5 = 25/8 : 5/4 i) (X x 0,25 + 2012) x 2013 = (50 + 2012) x 2013 k) (X - 1/2) x 5/3 = 7/4 - 1/2
|
1a)6,28x18,24+18,24x3,72 d)0,9x95+1,8x2+0,9
=18,24x(6,28+3,72) = 0,9x95+0,9x4+0,9
=18,24x10 =0,9(95+4+1)
=182,4 =0,9x100=90
b) 35,7x99+35+0,7 e)0,25x611,7x40
=35,7x99+35,7 =(0,25x40)x611,7
=35,7x(99+1) =10x611,7
=35,7x100 =6117
=357 g)37,2x101-37-0,2
c)17,34x99+18-0,66 = 101x37,2-(37+0,2)
=17,34x99+17,34 =101x37,2-37,2
=17,34x(99+1) =37,2x(101-1)
=17,34x100 =37,2x100
=1734 =3720
Bạn ơi đăng từng bài thôi mk giải cho. Nhiều quá nhìn hoa mắt mặc dù bài rất dễ!!!
????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
tim x nha m.n
5 nhan [ 4 cong 6 nhan x] = 290
x nhan 3,7cong x nhan 6,3= 120
[15 nhan 4 - x] chia 0,5 = 100 chia 1/4
128 nhan xtru 12 nhan x tru 16 nhan x = 5208000
5 nhan x cong 3, 75nhan x cong 1,25 nhan x=20
[84,6 - 2 nhan x ] chia 3,02=5,1
jup mk vs mk dg voi
bn nao lm duoc thi ket ban mk nha
a, Ta có: 5*(4+(6*x))=290
suy ra:4+(6*x)=58
suy ra:6*x=54
suy ra:x=9
Bài dễ nhưng bấm bàn phím lâu quá,ghi trong giấy chắc xong nhanh hơn
giai theo cach cua cap 1 ik bn giai mk ko hiu
Tìm số tự nhiên χ:
a) (χ - 15) x 7 - 270 : 45 = 169
b) [( 4χ + 28) x3 + 55] : 5 = 35
c) (455 x χ : 2 x 6) : 5 = 31
d) 128 x χ - 12 x χ - 16 x χ = 520 800
e) (χ x 0,25 + 2022) x 2023 = (50 + 2022) x 2023
f) 4 x χ + 100 = χ + 280
g) (χ + 1) + (χ + 2) + (χ + 3) + .... + (χ + 100) = 7450
Em xin cách giải mấy câu trên ạ, em xin cảm ơn nhiều ạTT
a) (x - 15) × 7 - 270 : 45 = 169
(x - 15) × 7 - 6 = 169
(x - 15) × 7 = 169 + 6
(x - 15) × 7 = 175
x - 15 = 175 : 7
x - 15 = 25
x = 25 + 15
x = 40
b) [(4x + 28) × 3 + 55] : 5 = 35
(4x + 28) × 3 + 55 = 35 × 5
(4x + 28) × 3 + 55 = 175
(4x + 28) × 3 = 175 - 55
(4x + 28) × 3 = 120
4x + 28 = 120 : 3
4x + 28 = 40
4x = 40 - 28
4x = 12
x = 12 : 4
x = 3
c) (455 × x : 2 × 6) : 5 = 31
455 × x : 2 × 6 = 31 × 5
455 × x : 2 × 6 = 155
x × 455 : 2 × 6 = 155
x × 1365 = 155
x = 155 : 1365
x = 31/273
d) 128 × x - 12 × x - 16 × x = 520800
(128 - 12 - 16) × x = 520800
100 × x = 520800
x = 520800 : 100
x = 5208
e) (x × 0,25 + 2022) × 2023 = (50 + 2022) × 2023
(x × 0,25 + 2022) × 2023 = 2072 × 2023
(x × 0,25 + 2022) × 2023 = 4191656
x × 0,25 + 2022 = 4191656 : 2023
x × 0,25 + 2022 = 2072
x × 0,25 = 2072 - 2022
x × 0,25 = 50
x = 50 : 0,25
x = 200
f) 4 × x + 100 = x + 280
4 × x - x = 280 - 100
(4 - 1) × x = 180
3 × x = 180
x = 180 : 3
x = 60
g) (x + 1) + (x + 2) + (x + 3) + ... + (x + 100) = 7450
x + 1 + x + 2 + x + 3 + ... + x + 100 = 7450
100 × x + 100 × 101 : 2 = 7450
100 × x + 5050 = 7450
100 × x = 7450 - 5050
100 × x = 2400
x = 2400 : 100
x = 24
Trung bình mỗi ngày bán được số mét vải là:
3042,3÷6=507,05(m)
Đáp số:...