3(х+5)=902(х-6)=-34-2(х+12)=6х6(х-1)+3(5-х)=94(3х-2)-4(х-2)=25(6+х)-5(2х+7)=0решите...

Question

3(х+5)=90
2(х-6)=-34
-2(х+12)=6х
6(х-1)+3(5-х)=9
4(3х-2)-4(х-2)=2
5(6+х)-5(2х+7)=0
решите уравнение пжл

Answer 1

3(х+5)=90
3х+15=90
3х=90-15
3х=75
х=75/3
х=25
_________
2(х-6)=34
2х-12=34
2х=34+12
2х=46
х=46/2
х=23

Comments

-2(х+12)=6х

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-2х-24=6х 6х+2х=24 8х=24 х=24/8 х=3

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6(х-1)+3(5-х)=9 6х-6+15-3х=9 3х=9-15+6 3х=0

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х=0

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4(3х-2)-4(х-2)=2 12х-8-4х+8=2 8х=2 х=0,25

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5(6+х)-5(2х+7)=0 30+5х-10х-35=0 10х=5 х=0,5

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все понятно как написано?