a) \(70-5\left(2x-3\right)=45\)
\(70-10x+15=45\)
\(-10x=45-70-15\)
\(-10x=-40\)
\(x=4\)
vay \(x=4\)
b) \(156-\left(x+61\right)=82\)
\(x+61=156-82\)
\(x+61=74\)
\(x=74-61\)
\(x=13\)
vay \(x=13\)
c) \(6\left(5x+35\right)=330\)
\(30x+210=330\)
\(30x=330-210\)
\(30x=120\)
\(x=4\)
vay \(x=4\)
d) \(936-\left(4x+24\right)=72\)
\(4x+24=936-72\)
\(4x+24=864\)
\(4x=864-24\)
\(4x=840\)
\(x=210\)
vay \(x=210\)
\(70-5.\left(2x-3\right)\)\(=45\)
\(5.\left(2x-3\right)\)\(=\)\(70-45\)
\(5.\left(2x-3\right)\)\(=25\)
\(2x-3=25:5\)
\(2x-3=5\)
\(2x=8\)
\(x=8:2\)
\(x=4\)
\(156-\left(x+61\right)\)\(=82\)
\(x+61=156-82\)
\(x+61=74\)
\(x=74-61\)
\(x=13\)
\(6.\left(5x+35\right)\)\(=330\)
\(5x+35=330:6\)
\(5x+35=55\)
\(5x=55-35\)
\(5x=20\)
\(x=20:5\)
\(x=4\)
\(936-\left(4x+24\right)\)\(=72\)
\(4x+24=936-72\)
\(4x+24=864\)
\(4x=864-24\)
\(4x=840\)
\(x=840:4\)
\(x=210\)
Tìm x :
a) 70 - 5 . ( 2x - 3 ) = 45
5 . ( 2x - 3 ) = 70 - 45
5 . ( 2x - 3 ) = 25
2x - 3 = 25 : 5
2x - 3 = 5
2x = 5 + 3
2x = 8
x = 8 : 2
x = 4
b) 156 - ( x + 61 ) = 82
x + 61 = 156 - 82
x + 61 = 74
x = 74 - 61
x = 13
c) 6 . ( 5x + 35 ) = 330
5x + 35 = 330 : 6
5x + 35 = 55
5x = 55 - 35
5x = 20
x = 20 : 5
x = 4
d) 936 - ( 4x + 24 ) = 72
4x + 24 = 936 - 72
4x + 24 = 364
4x = 364 - 24
4x = 340
x = 340 : 4
x = 85
a) 70 - 5. (2x - 3) = 45
5. (2x - 3) = 70 - 45
5. (2x - 3) = 25
2x - 3 = 25 : 5
2x - 3 = 5
2x = 5 + 3
2x = 8
x = 8 : 2
x = 4
b) 156 - (x + 61) = 82
x + 61 =156 - 82
x + 61 = 74
x = 74 - 61
x = 13
c) 6. (5x + 35) = 330
5x + 35 = 330 : 6
5x + 35 = 55
5x = 55 - 35
5x = 20
x = 20 : 5
x = 4
d) 936 - (4x + 24) = 72
4x + 24 = 936 - 72
4x + 24 = 864
4x = 864 - 24
4x = 840
x =840 : 4
x = 210
