Question

tìm x bt

Answer 1

`3-x=15-(-5)`

`3-x=15+5`

`3-x=20`

`x=3-20`

`x=-17`

___________________________

`2-x=17-(-5)`

`2-x=17+5`

`2-x=22`

`x=2-22`

`x=-20`

________________________

`11-x=8-(-11)`

`11-x=8+11`

`11-x=19`

`x=11-19`

`x=-8`

Answer 2

`c) 3-x=15-(-5)`

`=> 3-x = 15+5 =20`

`<=> x =3-20 =-17`

Vậy `x=-17`

`d)2-x= 17-(-5)`

`=> 2-x = 17+5 =22`

`<=> x =2-22 =-20`

Vậy `x=-20`

`g) 11-x =8 -(-11)`

`=> 11-x = 8+11 =19`

`=> x= 11-19=-8`

Vậy `x=-8`