Question

tìm x bt

Answer 1

\(a,x+7=-18\\ x=-18-7\\ x=-25\\ a,x+25=-46\\ x=\left(-46\right)-25\\ x=-71\\ a,x+11=-45\\ x=-45-11\\ x=-56\)

Answer 2

a: =>x+7=-18

hay x=-25

b: =>x+25=-63+17=-46

=>x=-71

a: =>x-31+42=-45

=>x+11=-45

hay x=-56

Answer 3

`a, x + 12 + (-5) = -18`

`x + 7 = -18`

`x=  -25`

`b, x + 25 = -63 - (-17)`

`x + 25 = -46`

`x= -71`

`c, x + (-31) - (-42) =- 45`

`x - 31 + 42 = -45`

`x= -56`

Answer 4

a. x + 12 = -13

x = -13 - 12 = -25

b. x + 25 = -46

x = -46 - 25 = -71

c. x + (-31) = -87

x = -87 - (-31) = -56

Answer 5

\(x+12+\left(-5\right)=-18\\ x+12=-18-\left(-5\right)\\ x+12=23\\ x=23-12\\ x=11\)

---------

\(x+25=-63-\left(-17\right)\\ x+25=-63+17\\ x+25=-46\\ x=-46-25\\ x=-71\)

------

\(x+\left(-31\right)-\left(-42\right)=-45\\ x-31+42=-45\\ x=-45-42+31\\ x=-56\)