(8a-7b)-(4a-5b)+(3a-2b)
问题描述:
(8a-7b)-(4a-5b)+(3a-2b)
答
原式=8a-7b-4a+5b+3a-2b
=8a-4a+3a-7b+5b-2b
=7a-4b.