a-2b=3求a²-2ab-6b
问题描述:
a-2b=3求a²-2ab-6b
答
a²-2ab-6b
=a(a-2b)-6b
=3a-6b
=2(a-2b)
=6
a-2b=3求a²-2ab-6b
a²-2ab-6b
=a(a-2b)-6b
=3a-6b
=2(a-2b)
=6