Question

(-45).67-67.55= ?

Tìm x

​a) -11+(-x+25)=18

b) -11+8.x=-27

c) |12+x|=7

Giải giúp mk gấp nha ! :)

 

 

 

 

Answer 1

a)-x+25=29

=>-x=4

=>x=4

b)8x = -16

=>x=-2

=>x=2

c)=>\(\orbr{\begin{cases}12+x=7\\12+x=-7\end{cases}}\Rightarrow\orbr{\begin{cases}x=-5\\x=-19\end{cases}}\)

Answer 2

-45.67-67.55=-6700

-x+25=11+18

-x+25=29

x=25-29

x=-4

b -11+8x=-27

-3x=-27

x=-27:-3

x=9

c 12+x=7

12+x=-7

x=19

x=5

Answer 3

23+(-14)-(-45)+(+21)-16

-40+(12-27)-(-39-42)

(-17+27).(-3+(-2)²

(-3)³-4.[20-3.9]