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

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

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

(3a+2b)X(2a+b)—(2b+a)X(b+a),(3b+2a)X(b+2a)—(3bX2a)怎么解
(3a+2b)X(2a+b)—(2b+a)X(b+a)
=6a^2+3ab+4ab+2b^2-2b^2-2ab-ab-a^2
=5a^2+4ab
(3b+2a)X(b+2a)—(3bX2a)
=3b^2+6ab+2ab+4a^2-6ab
=3b^2+2ab+4a^2

5a^2+4ab
3b^2+4a^2+2ab
心算的,不知道准不准