2(2a一3b )十3(2b一3a)
问题描述:
2(2a一3b )十3(2b一3a)
答
2(2a一3b )十3(2b一3a)
=4a - 6b+6b-9a
=-5a
2(2a一3b )十3(2b一3a)
2(2a一3b )十3(2b一3a)
=4a - 6b+6b-9a
=-5a