(x+3y)(2x-y);16-(2a+3b)²;﹣36x²+12xy-y²;4x(a-b)-8y(b-a);(x²-5)²+8(x²-5)+16

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(x+3y)(2x-y);16-(2a+3b)²;﹣36x²+12xy-y²;4x(a-b)-8y(b-a);(x²-5)²+8(x²-5)+16
(x+3y)(2x-y);16-(2a+3b)²;﹣36x²+12xy-y²;
4x(a-b)-8y(b-a);(x²-5)²+8(x²-5)+16

(x+3y)(2x-y);16-(2a+3b)²;﹣36x²+12xy-y²;4x(a-b)-8y(b-a);(x²-5)²+8(x²-5)+16
(x+3y)(2x-y)
=x(2x-y)+3y(2x-y)
=2x²-xy+6xy-3y²
=2x²+5xy-3y²
16-(2a+3b)²
=[4-(2a+3b)][4+(2a+3b)]
=(4-2a-3b)(4+2a+3b)
﹣36x²+12xy-y²
=﹣(36x²-12xy+y)²
=-(6x-y)²
4x(a-b)-8y(b-a);
=4x(a-b)+8y(a-b)
=4(a-b)(x+2y)
(x²-5)²+8(x²-5)+16
=(x²-5+4)²
=(x²-1)²
=[(x-1)(x+1)]²
=(x-1)²(x+1)²

(x+3y)(2x-y);
=x^2-xy+6xy-3y^2
=x^2+5xy-3y^2
16-(2a+3b)²;
=[4+(2a+3b)][4-(2a+3b)]
=(4+2a+3b)(4-2a-3b)
﹣36x²+12xy-y²;
=-(36x^2-12xy+y^2)
=-(6x-y)^2
4x...

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(x+3y)(2x-y);
=x^2-xy+6xy-3y^2
=x^2+5xy-3y^2
16-(2a+3b)²;
=[4+(2a+3b)][4-(2a+3b)]
=(4+2a+3b)(4-2a-3b)
﹣36x²+12xy-y²;
=-(36x^2-12xy+y^2)
=-(6x-y)^2
4x(a-b)-8y(b-a);
=4x(a-b)-[-8y(a-b)]
=4x(a-b)+8y(a-b)
=4(a-b)(x+2y)
(x²-5)²+8(x²-5)+16
=[(x^2-5)+4]^2
=(x^2-1)^2
=[(x++1)(x-1)]^2
=(x+1)^2(x-1)^2

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(x+3y)(2x-y);
=2x²+5xy-3y²

16-(2a+3b)²;
=(4-2a-3b)(4+2a+3b)

﹣36x²+12xy-y²;
=-(36x²-12xy+y²)
=-(6x-y)²

4x(a-b)-8y(b...

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(x+3y)(2x-y);
=2x²+5xy-3y²

16-(2a+3b)²;
=(4-2a-3b)(4+2a+3b)

﹣36x²+12xy-y²;
=-(36x²-12xy+y²)
=-(6x-y)²

4x(a-b)-8y(b-a);
=4x(a-b)+8y(a-b)
=4(a-b)(x+2y)
(
(x²-5)²+8(x²-5)+16
=(x²-5+4)²
=(x²-1)²
=(x-1)²(x+1)²

收起

1.(-2a)³·b²÷(8a³b²) 2.-5x(2x²-3x+4)+4x³+15x3.(x²-2y²)(x+2y)-2xy(x-y)4.(x-y+z)(x-y-z)化简求值 [(x+y)(x-y)-(x+y)²-2y(x-2y)]÷(-2y),其中x=5,y=2003 (x+y)^2-z^=a^2-(b-c)^2=(x-y)^3-x+y=16(x+y)^2-25(x-y)^2= (2x-y)乘(2x+y)+(2x-y)乘(y-4x)+2y(y-3x) (x+y)a平方-(x+y)因式分解,(1) (x+y)a平方-(x+y)(2) 4y平方-4xy+x平方(3) (x-y)平方-8(x-y)+16 化简((X-2Y)的平方+(X-Y)(x+Y)-2(X-3Y)(X-Y))除以Y 把6x(x-y)的平方+3(y-x)的立方分解因式我知道答案是6x(x-y)^2+3(y-x)^3=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)]=3(x-y)^2(x+y)可为什么=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)] 2(x-y)²-3(x-y)(-y-x) [1]a(x-2y)-b(2y-x)+d(2x-4y) [2]x平方-2xy+y平方-2x+2y+1 【3】一(a-x)(a-y)-x(y-a)(X-a)[1]a(x-2y)-b(2y-x)+d(2x-4y) [2]x平方-2xy+y平方-2x+2y+1【3】一(a-x)(a-y)-x(y-a)(X-a) 分解因式,急求! 已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值. {(x-y)²+(x+y)(x-y)}÷2x 如果A={(x,y)|x,y+2>0},B={(x,y)|2x+3y-6>0},C={(x,y)|x-4 1.x(x-y)+y(y-x)2.9(a-b)^2-16(a+b)^2 3.25(x-y)^2+10(y-x)+1 a²(x-y)²-2a(x-y)²-y(y-x)3次 分解因式 因式分解:(1)、(2a-3b)(7x+y)+(x-5y)(3b-2a)(2)、(x+y)^3(x+y)^2-(-x-y) 设a={(x,y)|2x-y=1},b={(x,y)|2x+y=0},求a∩b 设集合A={(x.y)|2x+y=1},B={(x.y)|x-2y=2},求A∩B 已知:集合A={(x,y)|3x-2y=11},B={(x,y)|2x+3y=16},求A∩B 设A={(x,y)|3x-2y=11},B={(x,y)|2x+3y=16},求A交集B