(a+2b)(5a+3b)=()
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(a+2b)(5a+3b)=()(a+2b)(5a+3b)=()(a+2b)(5a+3b)=()5a^2+13ab+6b^2=5a2+13ab+6b25a^2+13ab+6b^25a平方+13ab+6
(a+2b)(5a+3b)=()
(a+2b)(5a+3b)=()
(a+2b)(5a+3b)=()
5a^2+13ab+6b^2
=5a2+13ab+6b2
5a^2+13ab+6b^2
5a平方+13ab+6b平方=0
5a²+13ab+6b²