3x + y = 7. 2x + y = 12 -5x +2y =3. 7x - 2y = 31 - вопрос №12640348372125237231 от rortat32 25.09.2021 01:33

Question

Математика: 3x + y = 7. 2x + y = 12 -5x +2y =3. 7x - 2y = 31​

rortat32 · Answer

1) у=7-3х   -5х+2(7-3х)=3у=7-3х-5х+14-6х=3у=7-3х-11х=3-14у=7-3хх=1у=7-3х=1у=4х=1 2) у=12-2х7х-2у=31у=12-2х7х-24+4х=31у=12-2х11х=55у=2х=5...

3x + y = 7. 2x + y = 12 -5x +2y =3. 7x - 2y = 31​