两道因式分解1.A²+6AB+9B²-16X²Y² 2.(1-A²)×(1-B²)-4AB
问题描述:
两道因式分解1.A²+6AB+9B²-16X²Y² 2.(1-A²)×(1-B²)-4AB
答
A²+6AB+9B²-16X²Y² =(A+3B)^2-(4XY)^2=(A+3B-2XY)(A+3B+2XY)(1-A²)(1-B²)-4AB=1-A²-B²+A²B²-4AB=(1-2AB+A²B²)-(A²+B²+2AB)=(1-AB)²-(A...