解一元二次方程组.(x+y)/2+(x-y)/3=6 4(x+y)-5(x-y)=2
问题描述:
解一元二次方程组.(x+y)/2+(x-y)/3=6 4(x+y)-5(x-y)=2
用加减消元
答
3x+3y+2x-2y=36
4x+4y-5x+5y=2
=>
5x+y=36(1)
-x+9y=2(2)
(1)+(2)*5得
46y=46
y=1
x=7