1/12
=1/24+1/24
=1/24+1/48+1/48
=1/24+1/48+3/144
=1/24+1/48+2/144+1/144
=1/24+1/48+1/72+1/144
（x-2）²-2（x+3）（x-2），
=(x²-4x+4)-2(x²+x-6)
=x²-4x+4-2x²-2x+12
=-x²-6x+16
=-9-18+16
=-11
（1）4x²-64
=4(x²-16)
=4(x+4)(x-4)
（2）4ab²-4a²b-b³
=-b(4a²-4ab+b²)
=-b(2a-b)²
内容全部来源于网络收集，如有侵权，请联系网站删除：QQ：24596024