解下列二元一次方程组.(过程一定要详细) 70
1.m/2+n/3=62.(4+1.5)x+4y=424m-5n=23+5x+42=13y3.2.5x+2.5y=4004.x+y=68012.5x-12.5y=4001...
1.m/2+n/3=6 2. (4+1.5)x+4y=42
4m-5n=2 3+5x+42=13y
3. 2.5x+2.5y=400 4. x+y=680
12.5x-12.5y=400 12‰x+13‰=84.2
5.2(x+2y)=560 6. x+y=500
4(x+y)=800 [(1+50‰)x+(1+40‰)y]=500+157 展开
4m-5n=2 3+5x+42=13y
3. 2.5x+2.5y=400 4. x+y=680
12.5x-12.5y=400 12‰x+13‰=84.2
5.2(x+2y)=560 6. x+y=500
4(x+y)=800 [(1+50‰)x+(1+40‰)y]=500+157 展开
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