1.(x+y)(x+y-1)-12因式分解2计算1.(x+1)(x+3)(x+5)(x+7)2.2004²+2*2005²+2006²-4010²3.当x=2时,求1+x+x(1+x)+x(1+x)²+………+x(1+X)² °°³ 4.x²-3x=1,则多项式3x³-11x²+3x+2的植等于___5
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![1.(x+y)(x+y-1)-12因式分解2计算1.(x+1)(x+3)(x+5)(x+7)2.2004²+2*2005²+2006²-4010²3.当x=2时,求1+x+x(1+x)+x(1+x)²+………+x(1+X)² °°³ 4.x²-3x=1,则多项式3x³-11x²+3x+2的植等于___5](/uploads/image/z/15208709-5-9.jpg?t=1.%28x%2By%29%28x%2By-1%29-12%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A32%E8%AE%A1%E7%AE%971.%28x%2B1%29%28x%2B3%29%28x%2B5%29%28x%2B7%292.2004%26sup2%3B%2B2%2A2005%26sup2%3B%2B2006%26sup2%3B-4010%26sup2%3B3.%E5%BD%93x%3D2%E6%97%B6%2C%E6%B1%821%2Bx%2Bx%281%2Bx%29%2Bx%281%2Bx%29%26sup2%3B%2B%E2%80%A6%E2%80%A6%E2%80%A6%2Bx%281%2BX%29%26sup2%3B+%C2%B0%C2%B0%26sup3%3B+4.x%26sup2%3B-3x%3D1%2C%E5%88%99%E5%A4%9A%E9%A1%B9%E5%BC%8F3x%26sup3%3B-11x%26sup2%3B%2B3x%2B2%E7%9A%84%E6%A4%8D%E7%AD%89%E4%BA%8E%EF%BC%BF%EF%BC%BF%EF%BC%BF5)
1.(x+y)(x+y-1)-12因式分解2计算1.(x+1)(x+3)(x+5)(x+7)2.2004²+2*2005²+2006²-4010²3.当x=2时,求1+x+x(1+x)+x(1+x)²+………+x(1+X)² °°³ 4.x²-3x=1,则多项式3x³-11x²+3x+2的植等于___5
1.(x+y)(x+y-1)-12因式分解
2计算1.(x+1)(x+3)(x+5)(x+7)
2.2004²+2*2005²+2006²-4010²
3.当x=2时,求1+x+x(1+x)+x(1+x)²+………+x(1+X)² °°³
4.x²-3x=1,则多项式3x³-11x²+3x+2的植等于___
5.梯形上下底的长分别为5和8,两条对角线的长分别为5和12,这个梯形的面积为___
6.因式分解(x+y)²+4(x-y)²-4(x²-y²)
会几道就做几道,
1.(x+y)(x+y-1)-12因式分解2计算1.(x+1)(x+3)(x+5)(x+7)2.2004²+2*2005²+2006²-4010²3.当x=2时,求1+x+x(1+x)+x(1+x)²+………+x(1+X)² °°³ 4.x²-3x=1,则多项式3x³-11x²+3x+2的植等于___5
1
原式= (x+y)[(x+y)+1]-12 = (x+y)^2 + (x+y) -12 = (x+y+4)(x+y-3)
5
平移一条对角线,可以发现重新得到的图形中有一个直角三角形
这个直角三角形的三条边分别为5,12,13(13是由上底+下底=5+8得到)
所以梯形面积为5*12/2=30
6
原式=(x+y)²-2·2(x-y)(x+y)+2²(x-y)²
=[(x+y)-2(x-y)]²
=(3y-x)²