x+y=15,(1+10%)X+(1+15%)y=17的解是
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x+y=15,(1+10%)X+(1+15%)y=17的解是
x+y=15,(1+10%)X+(1+15%)y=17的解是
x+y=15,(1+10%)X+(1+15%)y=17的解是
x+y=15,x=15-y
(1+10%)X+(1+15%)y=17 1.1x+1.15y=17
把 x=15-y 代入1.1x+1.15y=17得1.1*15-1.1y+1.15y=17 0.05y=17-16.5 y=10
x=15-y=15-10=5
x=5
y=10