(3a+2b)X(2a+b)—(2b+a)X(b+a),(3b+2a)X(b+2a)—(3bX2a)怎么解

问题描述:

(3a+2b)X(2a+b)—(2b+a)X(b+a),(3b+2a)X(b+2a)—(3bX2a)怎么解