(2a-3b)²-(b+3a)(3a-b)=?帮帮啊,各位大哥大姐

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(2a-3b)²-(b+3a)(3a-b)=?帮帮啊,各位大哥大姐(2a-3b)²-(b+3a)(3a-b)=?帮帮啊,各位大哥大姐(2a-3b)²-(b+3a)(3a-

(2a-3b)²-(b+3a)(3a-b)=?帮帮啊,各位大哥大姐
(2a-3b)²-(b+3a)(3a-b)=?
帮帮啊,各位大哥大姐

(2a-3b)²-(b+3a)(3a-b)=?帮帮啊,各位大哥大姐
(2a-3b)²-(b+3a)(3a-b)
=(4a²-12ab+9b²)-(9a²-b²)
=4a²-12ab+9b²-9a²+b²
=-5a²-12ab+10b²

10b²-12ab-5a²

=10b2-12ab-5a2