速度速速速速速速速速速1:分解因式:b²-(a-b+c)²= ;(2x+y)²-(2x-y)²_________;2:已知x,y互为相反数,且(x+2)²-(y+2)²=4,则x= y=3:分解因式 4x³-x ;(x+y)²-9x
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![速度速速速速速速速速速1:分解因式:b²-(a-b+c)²= ;(2x+y)²-(2x-y)²_________;2:已知x,y互为相反数,且(x+2)²-(y+2)²=4,则x= y=3:分解因式 4x³-x ;(x+y)²-9x](/uploads/image/z/9929968-16-8.jpg?t=%E9%80%9F%E5%BA%A6%E9%80%9F%E9%80%9F%E9%80%9F%E9%80%9F%E9%80%9F%E9%80%9F%E9%80%9F%E9%80%9F%E9%80%9F1%EF%BC%9A%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F%EF%BC%9Ab%26%23178%3B-%EF%BC%88a-b%2Bc%29%26%23178%3B%3D+%EF%BC%9B%EF%BC%882x%2By%EF%BC%89%26%23178%3B-%EF%BC%882x-y%EF%BC%89%26%23178%3B_________%3B2%EF%BC%9A%E5%B7%B2%E7%9F%A5x%2Cy%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2C%E4%B8%94%EF%BC%88x%2B2%EF%BC%89%26%23178%3B-%EF%BC%88y%2B2%EF%BC%89%26%23178%3B%3D4%2C%E5%88%99x%3D+y%3D3%EF%BC%9A%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F+4x%26%23179%3B-x+%EF%BC%9B%EF%BC%88x%2By%EF%BC%89%26%23178%3B-9x%26%2317)
速度速速速速速速速速速1:分解因式:b²-(a-b+c)²= ;(2x+y)²-(2x-y)²_________;2:已知x,y互为相反数,且(x+2)²-(y+2)²=4,则x= y=3:分解因式 4x³-x ;(x+y)²-9x
速度速速速速速速速速速
1:分解因式:b²-(a-b+c)²= ;(2x+y)²-(2x-y)²_________;
2:已知x,y互为相反数,且(x+2)²-(y+2)²=4,则x= y=
3:分解因式 4x³-x ;(x+y)²-9x² ; 2012²-144; (5又3/4)²-(2又1/4)²; 100²-99²+98²-97²+……+2²-1;
速度速速速速速速速速速1:分解因式:b²-(a-b+c)²= ;(2x+y)²-(2x-y)²_________;2:已知x,y互为相反数,且(x+2)²-(y+2)²=4,则x= y=3:分解因式 4x³-x ;(x+y)²-9x
b²-(a-b+c)²=(a+c)(2b-a-c) (2x+y)²-(2x-y)²=8xy
x+y=0 (x+2)²-(y+2)²=(x+y+4)(x-y)=4 x=1/2 y=-1/2
4x³-x=x(2x+1)(2x-1) (x+y)²-9x²=(4x+y)(y-2x)
2012²-144=(2012+12)(2012-12)=4048000
(5又3/4)²-(2又1/4)²=(5又3/4+2又1/4)(5又3/4-2又1/4)=28
100²-99²+98²-97²+……+2²-1
=(100+99)(100-99)+(98+97)(98-97)+…+(2+1)(2-1)
=100+99+98+97+…+2+1=5050