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krutoi20041
@krutoi20041
September 2021
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Дам 20 баллов.Найдите решение системы уравнений способом подстановки №(1499)
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Семма0106
1)2(х+у)-х=-6; 2х+2у-х=-6; х+2у=-6; х=-2у-6; х=-2у-6;
3х-(х-у)=0; 3х-х+у=0; 2х+у=0; 2(-2у-6)+у=0; -4у-12+у=0;
х=-2у-6; х=-2у-6; х=-14;
-3у=12; /*-1 3у=12; у=4;
2)3(х+2у)-у=27; 3х+6у-у=27; 3х+5у=27; 3(23-4у)+5у=27;
4(х+у)-3х=23; 4х+4у-3х=23; х+4у=23; х=23-4у;
96-12у+5у=27; -8у=-69; /*-1 8у=69; у=8,5; у=8,5
х=23-4у; х=23-4у; х=23-4у; х=23-4*8,5; х=-11;
3)5х-2(у+4)=0; 5х-2у-8=0; 5х-2у=8; 5х-2(12х-23)=8;
6(2х+3)-у=41; 12х+18-у=41; -у=23-12х; /*-1 у=12х-23;
5х-24х-46=8; -19х=8+46;/*-1 19х=-54; х=- 2,84;
у=12х-23; у=12х-23; у=12х-23; у=11,1;
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Answers & Comments
3х-(х-у)=0; 3х-х+у=0; 2х+у=0; 2(-2у-6)+у=0; -4у-12+у=0;
х=-2у-6; х=-2у-6; х=-14;
-3у=12; /*-1 3у=12; у=4;
2)3(х+2у)-у=27; 3х+6у-у=27; 3х+5у=27; 3(23-4у)+5у=27;
4(х+у)-3х=23; 4х+4у-3х=23; х+4у=23; х=23-4у;
96-12у+5у=27; -8у=-69; /*-1 8у=69; у=8,5; у=8,5
х=23-4у; х=23-4у; х=23-4у; х=23-4*8,5; х=-11;
3)5х-2(у+4)=0; 5х-2у-8=0; 5х-2у=8; 5х-2(12х-23)=8;
6(2х+3)-у=41; 12х+18-у=41; -у=23-12х; /*-1 у=12х-23;
5х-24х-46=8; -19х=8+46;/*-1 19х=-54; х=- 2,84;
у=12х-23; у=12х-23; у=12х-23; у=11,1;