题目内容
计算:(1)
.
(2)
.
(3)
.
(4)[(x+2y)2﹣(x+y)(3x﹣y)﹣5y2]÷2x.
(5)(2x﹣y+1)(2x+y﹣1).
(6)(x﹣y)2(x2+y2)2(x+y)2.
(7)(2x)3(﹣2y3)÷(16xy2).
(8)(﹣2x+y)2﹣(2x﹣y)(﹣y﹣2x)+(x﹣2y)(y﹣2x).
(9)[(﹣2x2y)2xy2﹣6x3(xy2)3]÷(﹣2x4y4) .
(2)
(3)
(4)[(x+2y)2﹣(x+y)(3x﹣y)﹣5y2]÷2x.
(5)(2x﹣y+1)(2x+y﹣1).
(6)(x﹣y)2(x2+y2)2(x+y)2.
(7)(2x)3(﹣2y3)÷(16xy2).
(8)(﹣2x+y)2﹣(2x﹣y)(﹣y﹣2x)+(x﹣2y)(y﹣2x).
(9)[(﹣2x2y)2xy2﹣6x3(xy2)3]÷(﹣2x4y4) .
解:(1)原式=﹣32+16+1=﹣15;
(2)原式=
=
=﹣24b2c5;
(3)原式=﹣1+4+1=4;
(4)原式=[x2+4xy+4y2﹣(3x2﹣xy+3xy﹣y2)﹣5y2]÷2x
=[x2+4xy+4y2﹣3x2﹣2xy+y2﹣5y2]÷2x
=[﹣2x2+2xy]÷2x
=﹣x+y;
(5)原式=4x2﹣(y﹣1)2
=4x2﹣(y2﹣2y+1)
=4x2﹣y2+2y﹣1;
(6)原式=[(x﹣y)(x2+y2)(x+y)]2
=[(x2﹣y2)(x2+y2)]2
=[x4﹣y4]2
=x8﹣2x4y4+y8;
(7)原式=8x3(﹣2y3)÷(16xy2)=﹣x2y;
(8)原式=(y﹣2x)2﹣(y﹣2x)(y+2x)+(x﹣2y)(y﹣2x)
=(y﹣2x)(y﹣2x﹣y﹣2x+x﹣2y)
=(y﹣2x)(﹣2y﹣3x)
=﹣2y2﹣3xy+2xy+6x2
=﹣2y2﹣xy+6x2;
(9)原式=[4x4y2xy2﹣6x3x3y6]÷(﹣2x4y4)
=[4x5y4﹣6x6y6]÷(﹣2x4y4)
=﹣2x+3x2y2.
(2)原式=
=
=﹣24b2c5;
(3)原式=﹣1+4+1=4;
(4)原式=[x2+4xy+4y2﹣(3x2﹣xy+3xy﹣y2)﹣5y2]÷2x
=[x2+4xy+4y2﹣3x2﹣2xy+y2﹣5y2]÷2x
=[﹣2x2+2xy]÷2x
=﹣x+y;
(5)原式=4x2﹣(y﹣1)2
=4x2﹣(y2﹣2y+1)
=4x2﹣y2+2y﹣1;
(6)原式=[(x﹣y)(x2+y2)(x+y)]2
=[(x2﹣y2)(x2+y2)]2
=[x4﹣y4]2
=x8﹣2x4y4+y8;
(7)原式=8x3(﹣2y3)÷(16xy2)=﹣x2y;
(8)原式=(y﹣2x)2﹣(y﹣2x)(y+2x)+(x﹣2y)(y﹣2x)
=(y﹣2x)(y﹣2x﹣y﹣2x+x﹣2y)
=(y﹣2x)(﹣2y﹣3x)
=﹣2y2﹣3xy+2xy+6x2
=﹣2y2﹣xy+6x2;
(9)原式=[4x4y2xy2﹣6x3x3y6]÷(﹣2x4y4)
=[4x5y4﹣6x6y6]÷(﹣2x4y4)
=﹣2x+3x2y2.
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