解方程组2(2x+5y)=3.6 5(3x+2y)=8
问题描述:
解方程组2(2x+5y)=3.6 5(3x+2y)=8
答
2(2x+5y)=3.6····①
5(3x+2y)=8····②
①②化简得,
4x+10y=3.6····③
15x+10y=8····④
③-④,得
-11x=-4.4
x=0.4 代入③,得
y=0.2
所以x=0.4 ,y=0.2
答
2(2x+5y)=3.6
4x+10y=3.6
5(3x+2y)=8
15x+10y=8
15x+10y-4x-10y=8-3.6
11x=4.4 x=0.4 1.6+10y=3.6 10y=2 y=0.2
答
2(2x+5y)=3.6····①
5(3x+2y)=8····②
①②化简得,
4x+10y=3.6····③
15x+10y=8····④
③-④,得
-11x=-4.4
x=0.4 代入③,得
y=0.2
所以x=0.4 ,y=0.2
答
4x+10y=3.6
15x+10y=8
11x=4.4
x=0.4
y=0.2