Tìm x:
a. 75 x x = 1800
b. 1855 : x = 35
a. 75 x y = 1800
b. 1855 : y = 35
a. 75 x y = 1800
y = 1800 : 75
y = 24
b. 1855 : y = 35
y = 1855 : 35
y = 53
a) 75 x y = 1800
y = 1800 : 75
y = 24
b) 1855 : y = 35
y = 1855 : 35
y = 53
a) 75 x y = 1800
y = 1800 : 75
y = 24
b) 1855 : y = 35
y = 1855 : 35
y = 53
tìm X
75 x X = 1800
1855 : X = 35
X + X x 2 + 6 x X = 81
155 x X - X x 146 = 72
a) 75*x=1800
x=1800:75
x=24
b) 1855:x=35
x=1855:35
x=53
c)x+x*2+6*x=81
1*x+x*2+6*x=81
x*(1+2+6)=81
x*9=81
x=81:9
x=9
d)155*x-x*146=72
x*(155-146)=72
x*9=72
x=72:9
x=8
*) Ta có:
75 × x = 1800
x = 1800 : 75
x = 24
*) Ta có:
1855 : x = 35
x = 1855 : 35
x = 53
Tìm x: 1855 : x = 35
Tìm x:
a) 75 x x = 1800
b) 1855 : x = 35
Tick cho 5 bạn nhanh và chính xác nhất, còn ai mà hôm nay mik tick hơn 3 lần rồi thì chờ ngày mai tick
a) 75 x X = 1800
X = 1800 : 75
X =24
b) 1855 : x = 35
X = 1855 : 35
X = 53
a) 75 x X = 1800
X = 1800 : 75
X = 24
b) 1855 : x = 35
x = 1855 : 35
x = 53
a ) 75 x X = 1800
X = 1800 : 75
X = 24
b) 1855 : X = 35
X = 1855 : 35
X = 53
1 :
75 x X = 1800 1855 : X = 35 X : 204 = 543
2 :
12062 x 205 =
15458 x 340 =
2815111 x 12 =
1,
\(75\cdot x=1800\) \(1855:x=35\)
\(x=1800:75=24\) \(x=1855:35=53\)
\(\Rightarrow x=24\) \(\Rightarrow x=53\)
2,
\(12062\cdot205=2472710\)
\(15458\cdot340=5255720\)
\(2815111\cdot12=33781332\)
TK MK NHA. CHUCA BẠN HỌC TỐT.^_^
2 phút trước (09:20)
1 :
75 x X = 1800
X= 1800 : 75
X= 24
1855 : X = 35
X= 1855 : 35
X= 53
X : 204 = 543
X= 543 x 204
X= 110772
2 :
12062 x 205 = 2472710
15458 x 340 =5255720
2815111 x 12 = 33781332
1 :
x = 24
x = 53
x = 110772
2 :
= 2472710
= 5255720
= 33781332
tìm x:
a,32:(3xX-2)=8
b,75:(X-18)=25
c,(15-6xX)x243=729
d,4x(X-12)+9=17
e,20-2x(X+4)=4
a) 32 : (3.x - 2) = 8
3x - 2 = 32 : 8
3x - 2 = 4
3x = 4 + 2
3x = 6
x = 6 : 3
x = 2
b) 75 : (x - 18) = 25
x - 18 = 75 : 25
x - 18 = 3
x = 3 + 18
x = 21
c) (15 - 6.x) . 243 = 729
15 - 6x = 729 : 243
15 - 6x = 3
6x = 15 - 3
6x = 12
x = 12 : 6
x = 2
d) 4.(x - 12) + 9 = 17
4(x - 12) = 17 - 9
4(x - 12) = 8
x - 12 = 8 : 4
x - 12 = 2
x = 2 + 12
x = 14
e) 20 - 2.(x + 4) = 4
2(x + 4) = 20 - 4
2(x + 4) = 16
x + 4 = 16 : 2
x + 4 = 8
x = 8 : 2
x = 4
`32: ( 3xx x -2)=8`
`3xx x-2=32:8`
`3xx x-2=4`
`3 xx x=4+2`
`3xx x=6`
`x=6:3`
`x=2`
__
`75 : (x-18) =25`
`x-18=75:25`
`x-18= 3`
`x=3+18`
`x=21`
__
`(15-6 xx x ) xx 243 =729`
`15-6 xx x = 729 : 243`
`15-6 xx x = 3`
`6 xx x=15-3`
`6 xx x=12`
`x=12:6`
`x=2`
__
`4 xx (x-12)+9=17`
`4 xx (x-12)=17-9`
`4 xx (x-12)= 8`
`x-12=8:4`
`x-12=2`
`x=2+12`
`x=14`
__
`20-2xx(x+4)=4`
`2xx(x+4)=20-4`
`2xx(x+4)=16`
`x+4=16:2`
`x+4=8`
`x=8-4`
`x=4`
\(a,32:\left(3\times X-2\right)=8\\ 3\times X-2=32:8=4\\ 3\times X=4+2=6\\ X=\dfrac{6}{3}=2\\ Vậy:X=2\\ ---\\ b,75:\left(X-18\right)=25\\ X-18=75:25=3\\ X=3+18=21\\ Vậy:X=21\\ ---\\ c,\left(15-6\times X\right)\times243=729\\ 15-6\times X=729:243=3\\ 6\times X=15-3=12\\ X=\dfrac{12}{6}=2\\ Vậy:X=2\\ ---\\ d,4\times\left(X-12\right)+9=17\\ 4\times\left(X-12\right)=17-9=8\\ X-12=8:4=2\\ X=2+12=14\\ Vậy:X=14\\ ---\\ e,20-2\times\left(X+4+4\right)=4\\ 2\times\left(X+4\right)=20-4=16\\ X+4=16:2=8\\ X=8-4=4\\ Vậy:X=4\)
Tìm x:
a) \(x\) + \(\dfrac{-3}{7}=\dfrac{4}{7}\).
b) \(\dfrac{1}{2}x-75\%=\dfrac{1}{4}.\)
c) \(\left|x-\dfrac{2}{3}\right|+2,25=\dfrac{3}{4}\).
c) Ta có: \(\left|x-\dfrac{2}{3}\right|+2.25=\dfrac{3}{4}\)
\(\Leftrightarrow\left|x-\dfrac{2}{3}\right|=\dfrac{3}{4}-\dfrac{9}{4}=\dfrac{-3}{2}\)(vô lý)
Vậy: \(x\in\varnothing\)
a) Ta có: \(x+\dfrac{-3}{7}=\dfrac{4}{7}\)
\(\Leftrightarrow x-\dfrac{3}{7}=\dfrac{4}{7}\)
hay x=1
Vậy: x=1
b) Ta có: \(\dfrac{1}{2}x-75\%=\dfrac{1}{4}\)
\(\Leftrightarrow x\cdot\dfrac{1}{2}=1\)
hay x=2
Vậy: x=2
Bài 2: Tìm x:
a) 156 – (x+ 61) = 82 b) (x-35) -120 = 0 c) 124 + (118 – x) = 217 d) 7x – 8 = 713 e) x- 36:18 = 12 f) (x- 36):18 = 12 g) (x-47) -115 = 0 |
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Bài 3: Tính nhanh
a) 58.75 + 58.50 – 58.25 b) 27.39 + 27.63 – 2.27 c) 128.46 + 128.32 + 128.22 d) 66.25 + 5.66 + 66.14 + 33.66 e) 12.35 + 35.182 – 35.94 | f) 48.19 + 48.115 + 134.52 g) 27.121 – 87.27 + 73.34 h) 125.98 – 125.46 – 52.25 i) 136.23 + 136.17 – 40.36 j) 17.93 + 116.83 + 17.23 | k) 35.23 + 35.41 + 64.65 l) 29.87 – 29.23 + 64.71 m) 19.27 + 47.81 + 19.20
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Bài 4: Tính giá trị của biểu thức sau:
a) 2763 + 152 b) (-7) + (-14) c) (-35) + (-9) d) (-5) + (-248) e) (-23) + 105 f) 78 + (-123) g) 23 + (-13) h) (-23) + 13 i) 26 + (-6) | j) 80 + (-220) k) (-23) + (-13) l) (-26) + (-6) | m) 12 – 34 n) -23 – 47 o) 31 – (-23) p) -9 – (-5) q) 6 – (8 – 17) r) 19 + (23 – 33) s) (-12 – 44) + (-3) t) 4 – (-15) u) -29 – 23 | v) 99 – [109 + (-9)] w) (-75) + 50 x) (-75) + (-50) y) (-23) + 13 + ( - 17) + 57 z) 14 + 6 + (-9) + (-14)
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a: =>x+61=74
hay x=13
b: =>x-35=120
hay x=155
d: =>7x=721
hay x=103
: Tìm x
a, 75 x x = 1800
b, 1855 : x = 35
c, x x 405 = 86265
a, 75 x x = 1800 x = 1800 : 75 x = 24 c, x x 405 = 86265 x = 86265 : 405 x = 213 Đây nha em.
a, 75 x X = 1800
x= 1800:75
x= 24
b, 1855:X = 35
x=1855:35
x =53