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Villi2012
@Villi2012
June 2022
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2x-6(x+3y)=45-3y
6(5x-7y)=126+10x
найдите x*y
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Answers & Comments
Reginochka9
2x-6(x+3y)=45-3y
6(5x-7y)=126+10x;
2х-6х-18у=45-3у
30х-42у=126+10х;
2х-6х-18у-45+3у=0
30х-42у-126-10х=0;
-4х-15у-45=0
20х-42у-126=0;
х=(42у+126)/20
-4х-15у-45=0;
х=(42у+126)/20
-4((42у+126)/20)-15у-45=0;
х=(42у+126)/20
-4(2,1у+6,3)-15у-45=0;
х=(42у+126)/20
-8,4у-25,2-15у-45=0;
х=(42у+126)/20
-23,4у=70,2;
у=-3
х=(42у+126)/20;
у=-3
х=(42*(-3)+126)/20;
у=-3
х=(-126+126)/20;
у=-3
х=0.
Ответ:(0;-3)
1 votes
Thanks 3
Reginochka9
0*(-3)=0
Villi2012
пасибо :)
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Answers & Comments
6(5x-7y)=126+10x;
2х-6х-18у=45-3у
30х-42у=126+10х;
2х-6х-18у-45+3у=0
30х-42у-126-10х=0;
-4х-15у-45=0
20х-42у-126=0;
х=(42у+126)/20
-4х-15у-45=0;
х=(42у+126)/20
-4((42у+126)/20)-15у-45=0;
х=(42у+126)/20
-4(2,1у+6,3)-15у-45=0;
х=(42у+126)/20
-8,4у-25,2-15у-45=0;
х=(42у+126)/20
-23,4у=70,2;
у=-3
х=(42у+126)/20;
у=-3
х=(42*(-3)+126)/20;
у=-3
х=(-126+126)/20;
у=-3
х=0.
Ответ:(0;-3)