八年级上册数学整式乘法①a(a-b)-(a+b)(-2b)
问题描述:
八年级上册数学整式乘法①a(a-b)-(a+b)(-2b)
②化简求值(3x+2y)(4x-5y)-11(x+y)(x-y)+5xy,其中x=三又二分之一,y=负二又二分之一
3化简求值[xy(1-x)-2x(y-½)]*2x^2+2x^3y^2(X+1),其中x=-1,y=3
4解方程(X-3)(x-2)=(X+9)(x+1)+4
5 已知x²-8x-3=0,求(X-1)(X-3)(x-5)(x-7)的值
答
2.(3x+2y)(4x-5y)-11(x+y)(x-y)+5xy=12x²-15xy+8xy-10y²-11(x²-y²)+5xy=12x²-15xy+8xy-10y²-11x²+11y²+5xy=x²-2xy+y²=(x-y...