(3/2a的三次方-3/4a+5/6)-(8/15a的三次方-1/10a的二次方-2/9)怎样简化?
问题描述:
(3/2a的三次方-3/4a+5/6)-(8/15a的三次方-1/10a的二次方-2/9)怎样简化?
答
去括号
原式=3/2a³-3/4a+5/6-8/15a³+1/10a²+2/9
=(3/2-8/15)a³+1/10a²-3/4a+(5/6+2/9)
=61/30a³+1/10a²-3/4a+19/18