化简[21x^5y^7-28x^7y^4+7y(2x³y²)²]÷(-7x^5y^4)
化简[21x^5y^7-28x^7y^4+7y(2x³y²)²]÷(-7x^5y^4)
(x+y)²-(x³+y³)÷(x+y)
说明理由:多项式(5x³-7x³y+3x²y)+2x-(-7x³y+3x&sup
7-2xy-3x²y³+5x³y²z-9x⁴y³z&sup
数学整式除法计算:(1)(7x²y³-8x²y³z)÷8x²y&sup
3x³-【x³+(6x²-7x)-2(x³-3xy-4y)】,其中x=-1,y=
[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x,y满足x²+4x+y
再求代数式(4x²-7x+6y-1)-(-2x²+3y²+2y+2x)+(-6x²
化简再求值 4x³(-y³)²-3x×(-x)²(-y²)³
1、(4x²y-2x³)÷(-2x)²
x³y³-x²y²-xy+1
2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y