化简0.1X+0.5Y+(15-X-Y)=7

问题描述:

化简0.1X+0.5Y+(15-X-Y)=7

0.1X+0.5Y+(15-X-Y)=7
0.1X+0.5Y+15-X-Y=7
X+Y-0.1X-0.5Y=15-7
0.9X+0.5Y=8
两边乘10
9X+5Y=800.1X+0.5Y+(15-X-Y)=7 0.1(10-X)+0.5(10-Y)+(10-15+X+Y)=9请问这个怎么解这个方程组无解