1. Tính
345 : 5 x 131
2423 : 3 - 446
2. Tìm X
X - 35 = 653 , 345 + X = 4546
bài 1:đặt tính rồi tính
632*807 6358:47
5963:54 8520:35
bài 2:tìm x
x:35=54
3136:x=32
13/5-1/5:x=7/10
Tìm x,biết:
x+35=45
x+345=(32-25)
x *2-105=93:3
x+35=45
=>x=45 - 35
=>x=10
32-25=7
=>x+345=7
=>x=7 - 345
=>x= -338
93 : 3= 31
=> x*2-105= (31+105) : 2
=> x= 68
kick mik nha bạn
x - 35 = 45
x = 45 + 35
x = 80
x + 345 = ( 32 - 25 )
x + 345 = 7
x = 7 - 345
x = -338
x * 2 - 105 = 93 : 3
x * 2 - 105 = 31
x * 2 = 31 + 105
x * 2 = 136
x = 136 : 2
x = 68
x+35=45
x=45-35
x=10
x+345=(32-25)
x+345=7
x=7-345
x= - 338
xX2-105=93:3
xX2-105=31
xX2=31+105
xX2=136
X=136:2
X=68
Bài 1:Tìm x thuộc Z biết:
a, 2x+35=x-27
b,2x-41=3x+(-23)
c,4.(x-3) -3.(x-5)= 45 (-2)-34
Bài 2:Bỏ dấu ngoặc rồi tính:
a,-(-1234+345-29)-(1234+135-59)
GIÚP MIK NHA!
Bài 1:
a, 2x + 35 = x - 27
2x - x = -27 - 35
x = -62
b, 2x - 41 = 3x + (-23)
2x - 3x = -23 + 41
-x = 18
x = -18
c, 4 . (x - 3) - 3 . (x - 5) = 45 . (-2) - 34
4x - 12 - 3x + 15 = -90 - 34
4x - 3x = -90 - 34 + 12 - 15
x = -127
Bài 2:
- ( -1234 + 345 - 29 ) - ( 1234 + 135 - 59 )
= 1234 - 345 + 29 - 1234 - 135 + 59
= (1234 - 1234) - (345 + 135) + (29 + 59)
= 0 - 480 + 88
= -392
a)2x+35=x-27
2x-x=-27-35
1x=-62
x=-62:1
X=-62
1, a, 2x + 35 = x - 27
<=> 2x - x = -27 - 35
,<=> x = -72
Vậy x = -72
b, 2x - 41 = 3x + ( - 23 )
<=> 2x - 3x = 41 - 23
<=> -1x = 18
<=> x = -18
Vậy x = -18
c, tương tự dùng phân phối .
2, = 1234 - 345 + 29 - 1234 - 135 + 59
= ( 1234 - 1234 ) + ( -345 - 135 ) + ( 29 + 59 )
= 0 - 480 + 88 = -480 + 88 = -392
1) Tìm x
x - 35% . x = 1/25
2) Tính
a) 17 2/31 - ( 15/17 + 6 2/31 )
b) 27 51/59 - ( 25 51/29 - 1 1/3 )
c) ( 4 5/23 - 2 2/5 + 7 7/13 ) - ( 3 5/23 - 6 6/13 )
d) 8 1/3 + 7,8 + 5 2/3 - 1,8
Bài 1:
Ta có: \(x-35\%\cdot x=\dfrac{1}{25}\)
\(\Leftrightarrow65\%\cdot x=\dfrac{1}{25}\)
\(\Leftrightarrow x=\dfrac{1}{25}:\dfrac{13}{20}=\dfrac{1}{25}\cdot\dfrac{20}{13}=\dfrac{4}{65}\)
Vậy: \(x=\dfrac{4}{65}\)
Bài 2:
a) Ta có: \(17\dfrac{2}{31}-\left(\dfrac{15}{17}+6\dfrac{2}{31}\right)\)
\(=17\dfrac{2}{31}-\dfrac{15}{17}-6\dfrac{2}{31}\)
\(=11+\dfrac{2}{31}-\dfrac{15}{17}\)
\(=\dfrac{5366}{527}\)
1.tìm x
X x 6/7=5/14 X : 2/3=4/9
X-1/4=3/2 X+4/5=8/9
`x xx 6/7=5/14`
`=>x=5/14:6/7`
`=>x=5/14xx7/6`
`=>x=35/84`
`=>x=5/12`
Vậy `x=5/12`
__
`x:2/3=4/9`
`=>x=4/9xx2/3`
`=>x=8/27`
Vậy `x=8/27`
__
`x-1/4=3/2`
`=>x=3/2+1/4`
`=>x=6/4+1/4`
`=>x=7/4`
Vậy `x=7/4`
__
`x+4/5=8/9`
`=>x=8/9-4/5`
`=>x=40/45-36/45`
`=>x=4/45`
Vậy `x=4/45`
\(x\cdot\dfrac{6}{7}=\dfrac{5}{14}\)
\(x\) \(=\dfrac{5}{14}:\dfrac{6}{7}\)
\(x\) \(=\dfrac{5}{12}\)
\(x:\dfrac{2}{3}=\dfrac{4}{9}\)
\(x\) \(=\dfrac{4}{9}\cdot\dfrac{2}{3}\)
\(x\) \(=\dfrac{8}{27}\)
\(x-\dfrac{1}{4}=\dfrac{3}{2}\)
\(x\) \(=\dfrac{3}{2}+\dfrac{1}{4}\)
\(x\) \(=\dfrac{7}{4}\)
\(x+\dfrac{4}{5}=\dfrac{8}{9}\)
\(x\) \(=\dfrac{8}{9}-\dfrac{4}{5}\)
\(x\) \(=\dfrac{4}{45}\)
bài 5: đặt tính rồi tính
345 897 : 32=
Tìm x‚ biết:
a) [(-0.5)^3] = 1/64
b) 7^x+2 + 2×7^x-1 = 345
c) 3^x+1 + 3^x+3 = 810
d) 8^x × 16^-2x = 4^5
Tìm x , Biết
a) x + ( x+1) + (x+2)+...+(x+9)=345
b) 2^x . 5 + 2.3^x=10.24
c) 2^x+1 . 3-2x=40
a) x + ( x+1) + (x+2)+...+(x+9)=345
<=> 10x + (1 + 2 + 3 + ..... + 9) = 345
=> 10x + 45 = 345
=> 10x = 300
=> x = 30
Bài 1 : Tìm X
X/-2 = -18/X
X/2 + X/5 = 17/10
Bài 2 : Tính ( tính nhanh nếu có thể )
2 mũ 5 . 9 - 2 mũ 6 / 32.5 + 25. 3 mũ 2
Bài 3 : Tìm số nguyên X biết :
5/21 + -3/7 < X/21 < -2/7 + 8/21
Giúp nhanh đang gấp ạ!!!
Bài 1:
a: x/-2=-18/x
=>x2=36
=>x=6 hoặc x=-6
b: x/2+x/5=17/10
=>7/10x=17/10
hay x=17/7