Упростите: 5x+2x x+5x 8x+2x-x 7x+5-x+2 6•(x-2x) (7-2x)•20 9•2y•30

Question

Упростите:
5x+2x
x+5x
8x+2x-x
7x+5-x+2
6•(x-2x)
(7-2x)•20
9•2y•30

Answer 1

5х+2x=7х
x+5x=6х
8x+2x-x=9х
7x+5-x+2=6х+7
6•(x-2x)=6х-12х=-6х
(7-2x)•20=140-40х
9•2y•30=270*2у=540у

Comments

Спасибо большое

Answer 2

7х
6х
9х
6х+7

-(6х)

140-40х
540у