作业帮{2×5+x(y-5)=19 2×5+x(1.5y-5)=31怎么解?
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{2×5+x(y-5)=19 2×5+x(1.5y-5)=31怎么解?
{2×5+x(y-5)=19 2×5+x(1.5y-5)=31怎么解?
{2×5+x(y-5)=19 2×5+x(1.5y-5)=31怎么解?
2×5+x(y-5)=19 (1)
2×5+x(1.5y-5)=31 (2)
(2)与(1) 相减可得xy=24
将xy=24代入（1）式中可得x=3
那么根据xy=24可得y=8
10+xy-5x=19 10+1.5xy-5x=31
xy=24代入上面两式得x=3，y=8
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