12x²+4x-1 x²-(a+b)xy+aby² xy-1+x-y x²-(2
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12x²+4x-1 x²-(a+b)xy+aby² xy-1+x-y x²-(2a-1)x+a²-a 2x²+xy-y²-4x+5y-6 5x²+4x-1 x²-2x-1 y²+2xy-15x²
3x²+5xy-2y²+x+9y-4 x²-5z+3 3x²+4xy-y²
第三个和第四个连一块去了、第四个是 2x²+xy-y²-4x+5y-6 第九个是x²-5x+3
谢谢1L滴、可是没完呐~还有呐!
3x²+5xy-2y²+x+9y-4 x²-5z+3 3x²+4xy-y²
第三个和第四个连一块去了、第四个是 2x²+xy-y²-4x+5y-6 第九个是x²-5x+3
谢谢1L滴、可是没完呐~还有呐!
1. 12x2+4x-1=12(x+1/2)(x-1/6)
2. x2-(a+b)xy+aby2=(x-ay)(x-by)
3. xy-1+x-y=(x-1)(1+y)
4. x2-(2a-1)x+a2-a=(x-a)(x-a+1)
6. 5x2+4x-1=(x+1)(5x-1)
7. x2-2x-1= (x-1)2-2=(x-1+√2) (x-1-√2)
8. y2+2xy-15x2=(y+5x)(y-3x)
10. x2-5x+3= (x-5/2)2-13/4=(x-5/2+√13/2)( x-5/2-√13/2)
11. 3x2+4xy-y2=3(x+2y/3)2-7y2/3=[√3(x+2y/3)+√21/3y] [√3(x+2y/3)-√21/3y]
2. x2-(a+b)xy+aby2=(x-ay)(x-by)
3. xy-1+x-y=(x-1)(1+y)
4. x2-(2a-1)x+a2-a=(x-a)(x-a+1)
6. 5x2+4x-1=(x+1)(5x-1)
7. x2-2x-1= (x-1)2-2=(x-1+√2) (x-1-√2)
8. y2+2xy-15x2=(y+5x)(y-3x)
10. x2-5x+3= (x-5/2)2-13/4=(x-5/2+√13/2)( x-5/2-√13/2)
11. 3x2+4xy-y2=3(x+2y/3)2-7y2/3=[√3(x+2y/3)+√21/3y] [√3(x+2y/3)-√21/3y]
12x²+4x-1 x²-(a+b)xy+aby² xy-1+x-y x²-(2
1-x²+2xy-y²
计算:(1).(-2xy²)*(3x²y)²
越快越好(1)(xy²+3)(xy²+3)-2x(-x+y)(2)(x+2)(x²+4)(
x²-4y²/x²+2xy+y²÷x+2y/2x²+2xy
例如:a²+b²-c²-4d²-2ab+4cd x²+2xy+y&su
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y.若x
3x²-4xy+y²
3y/2x+2y+2xy/x²+xy 2x/x²-64y²-1/x-8y (1/a+1/b
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若|
设A=2x²-3xy+y²-x+2y ,B=4x²-6xy+2y²+3x-y .
已知a=2x²-3xy+y²,b=x²+2xy-3y²,化简:(1)a+b (2