xy=(x-10)(y+1) xy=(x-15)(y+3) 解方程组.
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xy=(x-10)(y+1)xy=(x-15)(y+3)解方程组.xy=(x-10)(y+1)xy=(x-15)(y+3)解方程组.xy=(x-10)(y+1)xy=(x-15)(y+3)解方程组.因
xy=(x-10)(y+1) xy=(x-15)(y+3) 解方程组.
xy=(x-10)(y+1) xy=(x-15)(y+3) 解方程组.
xy=(x-10)(y+1) xy=(x-15)(y+3) 解方程组.
因为：xy=(x-10)(y+1)→xy=xy+x-10y-10 ①
xy=(x-15)(y+3) →xy=+3x-15y-45 ②
由①、②得：x=10y+10 ③
x=5y+15 ④
将③‐ ④得：10y+10 =5y+15 →y=1
将 y=1代入③得：x=20
xy=xy+x-10y-10
xy=xy+3x-15y-45
所以 x=10y+10有3x=30y+30
又因为3x=15y+45
所以30y+30=15y+45
所以15y=15
y=1
x=20
绝对正确！
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方程组化为x-10y=10,x-5y=15解得x=20,y=1
xy=xy-10y+x-10
xy=xy-15y+3x-45
即x-10y=10
x-5y=15
即-5y=15
所以x=10
y=-1
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