求值:(1)已知:1x+1y=5,求2x?3xy+2yx+2xy+y的值.(2)已知x2+y2-8x-10y+41=0,求xy-yx的值
求值:(1)已知:1x+1y=5,求2x?3xy+2yx+2xy+y的值.(2)已知x2+y2-8x-10y+41=0,求xy-yx的值....
求值:(1)已知:1x+1y=5,求2x?3xy+2yx+2xy+y的值.(2)已知x2+y2-8x-10y+41=0,求xy-yx的值.
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