Question

ДАЮ 40 БАЛЛОВ!!!
(11) 3(2x + 8) - (5x + 2)
12)-3(3y +4) + 4(2y - 1)
(13) 8(3-2x) + 5(3x + 5)
14) 0,2(6x - 5) - 4(0,2x - 2)
(15) 3/4*(4/3х-4)-8(2 1/4/x + 3/8)
(16)1/3 (3x - 6) - 2/7 (7x-21)
(17)1/3 (0,3y - 0,6)-1/4(0,4y- 0,8)
(18) 1/6(6x-1,2)-3/5(5x-1,5) 6
(19) 2,4x - 5,1y -2,6x - 3,7y
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Answer 1

Ответ:

3(2x + 8) - (5x + 2)=6х+24-5х-2=х+22

-3(3y +4) + 4(2y - 1)=-9у-12+8у-4=-у-16

8(3-2x) + 5(3x + 5)=24-16х+15х+25=49-х

0,2(6x - 5) - 4(0,2x - 2)=1,2-1-0,8х+8=0,4х+7

3/4*(4/3х-4)-8(2 1/4/x + 3/8)=1/х-3-8(1/2х+3/8)=1/х-6-4/х=1-6х-4/х=-3-6х/х=-  3+6х/х

1/3 (3x - 6) - 2/7 (7x-21)=1/3(х-2)-2/7(х-3)=(х-2)-2(х-3)=х-2-2х+6=-х+4

1/3 (0,3y - 0,6)-1/4(0,4y- 0,8)=1/3(3/10  у-3/5)-1/4(2/5  у-4/5)=1/10  у-1/5-1/10  у+1/5=0+0=0

1/6(6x-1,2)-3/5(5x-1,5) 6=х-1/5-3х+9/10=-2х+7/10

2,4x - 5,1y -2,6x - 3,7y=-0,2х-8,8у

Пошаговое объяснение: