1、分解因式,mn+2mn²;4x²-y²;2、计算,3x²-2(5x-2x²)(-2xy²)²*3x²y/(-x³y四次方),(a-1)²-(1-a)(a+1),(x-2y+1)(x+2y-1),
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 19:38:17
![1、分解因式,mn+2mn²;4x²-y²;2、计算,3x²-2(5x-2x²)(-2xy²)²*3x²y/(-x³y四次方),(a-1)²-(1-a)(a+1),(x-2y+1)(x+2y-1),](/uploads/image/z/401714-26-4.jpg?t=1%E3%80%81%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F%2Cmn%2B2mn%26%23178%3B%EF%BC%9B4x%26%23178%3B-y%26%23178%3B%EF%BC%9B2%E3%80%81%E8%AE%A1%E7%AE%97%2C3x%26%23178%3B-2%EF%BC%885x-2x%26%23178%3B%EF%BC%89%EF%BC%88-2xy%26%23178%3B%EF%BC%89%26%23178%3B%2A3x%26%23178%3By%2F%EF%BC%88-x%26%23179%3By%E5%9B%9B%E6%AC%A1%E6%96%B9%EF%BC%89%2C%EF%BC%88a-1%EF%BC%89%26%23178%3B-%EF%BC%881-a%EF%BC%89%EF%BC%88a%2B1%EF%BC%89%2C%EF%BC%88x-2y%2B1%EF%BC%89%EF%BC%88x%2B2y-1%EF%BC%89%2C)
1、分解因式,mn+2mn²;4x²-y²;2、计算,3x²-2(5x-2x²)(-2xy²)²*3x²y/(-x³y四次方),(a-1)²-(1-a)(a+1),(x-2y+1)(x+2y-1),
1、分解因式,mn+2mn²;4x²-y²;2、计算,3x²-2(5x-2x²)
(-2xy²)²*3x²y/(-x³y四次方),(a-1)²-(1-a)(a+1),(x-2y+1)(x+2y-1),
1、分解因式,mn+2mn²;4x²-y²;2、计算,3x²-2(5x-2x²)(-2xy²)²*3x²y/(-x³y四次方),(a-1)²-(1-a)(a+1),(x-2y+1)(x+2y-1),
mn+2mn²=mn(1+2n)
4x²-y²=(2x+y)(2x-y)
2、计算,3x²-2(5x-2x²)=3x²-10x+4x²=7x²-10x
(-2xy²)²*3x²y/(-x³y^4)=4x²y^4×3x²y/(-x³y^4)
=12x^4y^5/(-x³y^4)=-12xy
(a-1)²-(1-a)(a+1)=(a-1)(a-1+a+1)=2a(a-1)
(x-2y+1)(x+2y-1)=x²-(2y-1)²=x²-4y²+4y-1