已知x-y=8 xy=7,则3xy-2x+2y+4(y-x)²=?
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已知x-y=8 xy=7,则3xy-2x+2y+4(y-x)²=?
已知x-y=8 xy=7,则3xy-2x+2y+4(y-x)²=?
已知x-y=8 xy=7,则3xy-2x+2y+4(y-x)²=?
原式=3xy-2(x-y)+4(x-y)²
=3×7-2×8+4×8²
=261
261
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