{3(x+Y)³-5(x+y)²-2x-2y}/(x+y)
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{3(x+Y)³-5(x+y)²-2x-2y}/(x+y)
{3(x+Y)³-5(x+y)²-2x-2y}/(x+y)
{3(x+Y)³-5(x+y)²-2x-2y}/(x+y)
原式=[3(x+Y)³-5(x+y)²-2(x+y)]/(x+y)
=3(x+y)²-5(x+y)-2
=3(x+y)(x+y-5)-2
=3x²+6xy+3y²-5x-5y-2
有什么不懂的可以继续追问,
{3(x+Y)³-5(x+y)²-2x-2y}/(x+y)
={3(x+Y)³-5(x+y)²-2﹙x+y﹚}/(x+y)
=3(x+Y)²-5(x+y)-2
=3x²+6xy+3y²-5x-5y-2
{3(x+Y)³-5(x+y)²-2x-2y}/(x+y)
=(x+y)[3(x+y)²-5(x+y)-2]/(x+y)
=[3(x+y)+1][(x+y)-2]
=(3x+3y+1)(x+y-2)
不明白可追问,满意请采纳
已知x+y=3
5(x+y)的平方-2x-2y+2
=5(x+y)的平方-2(x+y)+2
=5*3^2-2*3+2
=45-6+2
=41