(x+3y)(2x-y);16-(2a+3b)²;﹣36x²+12xy-y²;
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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
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(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
因式分解2x²y-xy-3y (-a+b)+c²(a-b)
(1).设A=2X²-3Xy+y²+X-3y,B=4X²-6xy+2y²+4X-
(1)16-(2a+3b)²(2)-36x²+12xy-y²(3)4x(a-b)-8y(b
已知A=x³-2y³+3x²y+xy²-3xy+4,B=y³-x
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(x+2y-3xy)-(-2x-y+xy),其中x+y=,xy=-,求值.
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x
3y/2x+2y+2xy/x²+xy 2x/x²-64y²-1/x-8y (1/a+1/b