初二数学分解公因式！！求解全过程
答案:1 悬赏:50 手机版
解决时间 2021-11-12 05:47
- 提问者网友：献世佛
- 2021-11-11 09:38
初二数学分解公因式！！求解全过程
最佳答案
- 五星知识达人网友：低血压的长颈鹿
- 2021-11-11 10:00
-14abc-7ab²+49abc²
=7ab(7c²-2c-b)
xy(2x-y)--2x(y-2x)²
=x(2x-y)(y-4x+2y)
=x(2x-y)(3y-4x)
8(x²-2y²)+x(7x+y)+xy ??????
2x³y^4-10x²y³-2x²y²
=2x²y²(xy²-5y-1)
(x+y)²-4(x+y-1)
=(x+y)²-4(x+y）+4
=（x+y-2)²
x³-4x²-21x
=x(x+3)(x-7)
x^4+10x²-11
=(x²-1)(x²+11)
=(x-1)(x+1)(x²+11)
x²+y²-z²+2xy
=(x+y)²-z²
=(x+y+z)(x+y-z)
=7ab(7c²-2c-b)
xy(2x-y)--2x(y-2x)²
=x(2x-y)(y-4x+2y)
=x(2x-y)(3y-4x)
8(x²-2y²)+x(7x+y)+xy ??????
2x³y^4-10x²y³-2x²y²
=2x²y²(xy²-5y-1)
(x+y)²-4(x+y-1)
=(x+y)²-4(x+y）+4
=（x+y-2)²
x³-4x²-21x
=x(x+3)(x-7)
x^4+10x²-11
=(x²-1)(x²+11)
=(x-1)(x+1)(x²+11)
x²+y²-z²+2xy
=(x+y)²-z²
=(x+y+z)(x+y-z)
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