初中因式分解（x2+3x+2)*(x2+7x+12)-120_数学解答

初中因式分解（x2+3x+2)*(x2+7x+12)-120

人气：328 ℃　时间：2020-04-16 21:21:16

解答

（X2+3X+2）（X2+7X+12）-120=[x^2+(2+1)x+1*2][x^2+(3+4)x+3*4]-120=(x+1)(x+2)(x+3)(x+4)-120=[(x+2)(x+3)][(x+1)(x+4)]-120=(x^2+5x+6)(x^2+5x+4)-120=(x^2+5x）^2+10(x^2+5x)+24-120=(x^2+5x)^2+10(x^2+5x)-96=(...那 (xy-1)2+(x+y-2)*(x+y-2xy)