240:(х+3)-5=7 16*(11-х:8)=64

Question

240:(х+3)-5=7

16*(11-х:8)=64

Comments

640:х*9-40=680

Answer 1

2)16*(11-x/8)=64;
16*((88-x)/8)=64;
2*(88-x)=64;
176-2*x=64;
-2*x=-112;
x=56;

Comments

спасибо большое помогите первое решить

Answer 2

1)240 / (х + 3) - 5 = 7
240 / (х + 3) = 7 + 5 
240 / (х + 3)  = 12
х + 3 = 240 / 12
 х + 3 = 20
х = 20 - 3
х = 17

2) 16 * ( 11 - х / 8 ) = 64
16 * 11  - 16* х / 8 = 64
176 - 2х  = 64
- 2х = - 176 - 64
-2х = - 112
х = 56

Comments

640:х*9-40=680