你是要题是吗?
1.m/2+n/3=6
4m-5n=2
2.2(2x+3y)+3(2x-3y)=7
4(2x-3y)-3(2x+3y)=2
3.(4+1.5)x+4y=42
3+5x+42=13y
4.2.5x+2.5y=400
12.5x-12.5y=400
5.x+y=680
12‰+13‰=84.2
6.2(x+2y)=560
4(x+y)=800 你是要题是吗?
1.m/2+n/3=6
4m-5n=2
2.2(2x+3y)+3(2x-3y)=7
4(2x-3y)-3(2x+3y)=2
3.(4+1.5)x+4y=42
3+5x+42=13y
4.2.5x+2.5y=400
12.5x-12.5y=400
5.x+y=680
12‰+13‰=84.2
6.2(x+2y)=560
4(x+y)=800