问题
计算题
x(x﹣1)(x+4)(x+5)﹣36.
答案
解:原式=x(x+4)(x﹣1)(x+5)﹣36
=[(x+2)2﹣4][(x+2)2﹣9]﹣36
=(x+2)2[(x+2)2﹣13]
=(x+2)2(x2+4x﹣9).
x(x﹣1)(x+4)(x+5)﹣36.
解:原式=x(x+4)(x﹣1)(x+5)﹣36
=[(x+2)2﹣4][(x+2)2﹣9]﹣36
=(x+2)2[(x+2)2﹣13]
=(x+2)2(x2+4x﹣9).