Решите уравнения : 1 ) 0.3 ( 0.4х -1.2,) + 0.36х = 34 2 ) 8 ( х -7 )- 3 ( 2х + 9 ) = 15...

Question

Решите уравнения :
1 ) 0.3 ( 0.4х -1.2,) + 0.36х = 34
2 ) 8 ( х -7 )- 3 ( 2х + 9 ) = 15
3 ) 0.15 ( у -4 ) = 9.9 - 0.3 ( у-1 )

Answer 1

1) 0.12x-0.36+0.36x=34
0.48x=33.64
x=70.08
2) 8x-56-6x-27=15
2x=15+56+27
2x=98
x=49
3)0.15y-0.6=9.9-0.3y+0.3
0.18y=10.8
y=60