Question

x+y/2+x-y/3=6,4(x+y)-5(x-y)=2用加减消元法解方程组

Answer 1

1,

x+y/2+x-y/3=6即：5x-y=36 ①

4(x+y)-5(x-y)=2 即:-x+9y=2 ②

①+②*5==可接

2,先化整：3（x+y）+2（x-y）=36①

4(x+y)-5(x-y)=2②

①*5+②*2可解