уравнение : 3х-1=2(x-2) ; 3(x+5)=7-5x ; 19(y-9)=3(y+7) ; 4(x-9)=3(x-8) ; 3(2x-9)=5(x-4) ; 7(3-2x)=15(1-x).. Created by zhaksylykaytzh. matematika-ru

уравнение : 3х-1=2(x-2) ; 3(x+5)=7-5x ; 19(y-9)=3(y+7) ; 4(x-9)=3(x-8) ; 3(2x-9)...

ДеловаяКреветка 1)3х-1=2х-4
3х-2х=-4+1
х=-3
2)3х+15=7-15
8х=-8
х=-1
3)19у-171=3у+21
19у-3у=21+171
16у=192
у=12
4)4х-36=3х-24
4х-3х=-24+36
х=12
5)21-14х=15-15х
-14х+15х=15-21
-х=-8
х=8

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alenkamihailovna 15-21=-6

alenkamihailovna 3х-1=2(x-2); 3х-1=2х-4; 3х-2х=-4+1; х=-3 3(x+5)=7-5x; 3х+15=7-5х; 3х+5х=7-15; х=-1 19(y-9)=3(y+7); 19у-171=3у+21; 16у=192; у=12 4(x-9)=3(x-8); 4х-3х=36-24; х=12 3(2x-9)=5(x-4); 6х-27=5х-20; х=7 7(3-2x)=15(1-x); 21-14х=15-15х; -14х+15х=15-21; х=-6

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