\(158\times0=0\)

( 126 + 32 ) x ( 18 - 16 - 2 )

= 158 x ( 2 - 2 )

= 158 x 0 

= 0

a) 16-x=21+8

     16-x=29

          x=16-29

          x=-13

b)x - 32= - 22

   x       = - 22 +32

   x       = 10

a) \(\text{16 - x = 21 - (-8).}\)

<=> \(\text{16 - x = 29.}\)

<=> \(x=-13.\)

Vậy \(x=-13.\)

b) \(\text{x - 32 = (-5) - 17}.\)

<=> \(\text{x - 32 = -22}.\)

<=> \(x=10.\)

Vậy \(x=10.\)

a)  x – 32 = − 5 − 17 ⇔ x – 32 = − 32 ⇔ x = − 32 + 32 ⇔ x = 0.

b)  16 – x = 21 – − 8 ⇔ 16 – x = 21 + 8 ⇔ 16 − x = 30 ⇔ − x = 30 − 16 ⇔ − x = 14 ⇔ x = − 14.

c)  106 − x = − 58 – 8 ⇔ 106 − x = − 66 ⇔ − x = − 66 − 106 ⇔ − x = − 172 ⇔ x = 172.

Bạn ơi bạn làm đc bao nhiêu thì làm phụ mình nhé 

bài1

a, 

5 - 7 + 3 +(-8)

= -2 + 3 + ( - 8)

=     1    + (-8)= -7

[ ( x + 32 ) - 17 ] . 2 + 8 = 50

[ ( x + 32 ) - 17 ] . 2 = 50 - 8

[ ( x + 32 ) - 17 ] . 2 = 42

( x + 32 ) - 17 = 42 : 2 

( x + 32 ) - 17 = 21

x + 32 = 21 + 17

x + 32 = 38

x = 38 - 32

x = 6

Vậy x = 6

=))

a) \(\Leftrightarrow\left(-63x^2+78x-15\right)+\left(63x^3+x-20\right)=44\)

\(\Leftrightarrow-63x^2+78x-15+63x^2+x-20=44\)

\(\Leftrightarrow79x-35=44\)

\(\Leftrightarrow79x=44+35\)

\(\Leftrightarrow79x=79\)

\(\Leftrightarrow x=1\)

b) \(\Leftrightarrow\left(x^2+3x+2\right).\left(x+5\right)-x^2.\left(x+8\right)=27\)

\(\Leftrightarrow x.\left(x^2+3x+2\right)+5.\left(x^2+3x+2\right)-x^3-8x^2=27\)

\(\Leftrightarrow x^3+3x^2+2x+5x^2+15x+10-x^3-8x^2=27\)

\(\Leftrightarrow17x+10=27\)

\(\Leftrightarrow17x=17\)

\(\Leftrightarrow x=1\)