7%x+10%(80-x)=6.5

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7%x+10%(80-x)=6.57%x+10%(80-x)=6.57%x+10%(80-x)=6.57%x+10%(80-x)=6.50.07x+8-0.1x=6.50.1x-0.07x=8-6.5

7%x+10%(80-x)=6.5
7%x+10%(80-x)=6.5

7%x+10%(80-x)=6.5
7%x+10%(80-x)=6.5
0.07x+8-0.1x=6.5
0.1x-0.07x=8-6.5
0.03x=1.5
x=1.5÷0.03
x=50

不懂可追问,有帮助请采纳,谢谢!

原式=7%X+8-10%X=6.5
3%X=1.5
X=50