6.6²-4*1.7²还有3（0.5-2）+2（2-0.5）因式分解

6.6²-4*1.7²还有3（0.5-2）+2（2-0.5）因式分解
6.6²-4*1.7²还有3（0.5-2）+2（2-0.5）因式分解

6.6²-4*1.7²还有3（0.5-2）+2（2-0.5）因式分解
6.6²-4*1.7²
=6.6²-(2*1.7)²
=6.6²-3.4²
=(6.6+3.4）*(6.6-3.4)
=10*3.2
=32
3（0.5-2）+2（2-0.5）
=3（0.5-2）-2（0.5-2）
=(3-2)*（0.5-2）
=1*(-1.5)
=-1.5

6.6²-4*1.7²
=6.6²-2²*1.7²
=6.6²-3.4²
=(6.6+3.4)(6.6-3.4)
=10×3.2
=32

3（0.5-2）+2（2-0.5）
=3(0.5-2)-2(0.5-2)
=(0.5-2)(3-2)
=-1.5