51问答网 > (2x+3y)²+(x-2y)(x+2y)-(5x^3y+2x²y²+5xy^3)÷xy,其中x=0.5,y=-3

(2x+3y)²+(x-2y)(x+2y)-(5x^3y+2x²y²+5xy^3)÷xy,其中x=0.5,y=-3

2025-01-05 21:47:54

推荐回答（3个）

回答1：

(2x+3y)²+(x-2y)(x+2y)-(5x^3y+2x²y²+5xy^3)÷xy
=4x²+12xy+9y²+x²-4y²-(5x²+2xy+5y²)
=4x²+x²-5x²+12xy-2xy+9y²-4y²-5y²
=10xy
x=0.5,y=-3
原式
=10×0.5×(-3)
=-15
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回答2：

(2x+3y)²+(x-2y)(x+2y)-(5x³y+2x²y²+5xy³)÷xy
=4x²+12xy+9y²+x²-4y²-5x²-2xy-5y²
=-4x²+10xy
-4×0.5²+10×(-0.5)×-3
=-1+15
=14

回答3：

(2x+3y)²+(x-2y)(x+2y)-(5x^3y+2x²y²+5xy^3)÷xy,其中x=0.5,y=-3
=4x²+12xy+9y²+x²-4y²-(5x²+2xy+5y²)
=5x²+12xy+5y²-(5x²+2xy+5y²)
=10xy
=10*0.5*(-3)
=-15

(2x+3y)&sup2;+(x-2y)(x+2y)-(5x^3y+2x&sup2;y&sup2;+5xy^3)÷xy,其中x=0.5,y=-3

(2x+3y)²+(x-2y)(x+2y)-(5x^3y+2x²y²+5xy^3)÷xy,其中x=0.5,y=-3