Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(a,120-\left(x-135\right)=300\)
\(x-135=120-300\)
\(x-135=-180\)
\(x=-180+135\)
\(x=-45\)
\(b,\left(102-3x\right):3=-19\)
\(102-3x=\left(-19\right)\times3\)
\(102-3x=57\)
\(3x=102-57\)
\(3x=45\)
\(x=15\)
a) 120 - ( x - 135 ) = 300
=> x - 135 = 120 - 300
=> x = ( -180 ) + 135
=> x = -45
b) ( 102 - 3x ) / 3 = -19
=> 102 - 3x = ( -19 ) * 3
=> 3x = 102 - ( -57 )
=> x = 159 / 3
=> x = 53
-3-2x+17=12-3x
-2x+3x=12-17+3
x=-2
b.43-2x-2=-48+x
-2x-x = -48+2-43
-3x=-89
x=-89/-3
c -253-2x=102+19-x
-2x+x=102+19+253
-x=374
x=-374
1,
a,1100+(-100)=1000
b,(2017)+2010=-7
c,/-102/+36=138
d,/-1002/+(-102)=900
e,(-1002)+(-102)+515=589
a) \(\frac{y+7}{-4y+1}=\frac{17}{-102}\)
\(\Leftrightarrow-102.\left(y+7\right)=17.\left(-4y+1\right)\)
\(\Leftrightarrow-102y+-714=-68y+17\)
\(\Leftrightarrow-102y-\left(-68y\right)=17-\left(-714\right)\)
\(\Leftrightarrow-102y+68y=17+714\)
\(\Leftrightarrow-34y=731\)
\(\Leftrightarrow y=731:\left(-34\right)=-21,5\)
Vậy: y=(-21,5)
a, 71.2 – 6.(2x+5) = 10 5 : 10 3
71.2 – 6.(2x+5) = 10 2
6.(2x+5) = 71.2 – 100
6.(2x+5) = 42
x = 1
b, 5 x + 3 4 . 6 8 = 6 9 . 3 4
5 x + 3 4 . 6 8 = 6 8 . 6 . 3 4
5 x + 3 4 = 6 8 . 6 . 3 4 : 6 8 = 6 . 3 4
5x = 6 . 3 4 - 3 4 = 5 . 3 4
x = 3 4
c, 12:{390:[5. 10 2 – ( 5 3 + x . 7 2 )]} = 4
390:[5. 10 2 – ( 5 3 + x . 7 2 )] = 12:4 = 3
5. 10 2 – ( 5 3 + x . 7 2 ) = 390:3 = 130
5 3 + x . 7 2 = 5. 10 2 – 130 = 370
x . 7 2 = 370 – 5 3 = 245
x = 245: 7 2 = 5
d, 5 3 .(3x+2):13 = 10 3 : 13 5 : 13 4
5 3 .(3x+2):13 = 10 3 : 13
3x+2 = 10 3 : 13 : 5 3 .13 = 8
x = 2
a)=537
b)=15
a) 102 - (x - 135) = 300
x - 135 = 102 - 300
x - 135 = -198
x = -198 + 135
x -63
b) (102 - 3x) : 3 = -19
(102 - 3x) = -19.3
102-3x = -57
3x = 102 - (-57)
3x = 159
x = 159 : 3
x = 53