计算(3a+2b)(3a-2b)-(a+2b)(5a-2b)/a-2b

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计算(3a+2b)(3a-2b)-(a+2b)(5a-2b)/a-2b
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计算(3a+2b)(3a-2b)-(a+2b)(5a-2b)/a-2b
计算(3a+2b)(3a-2b)-(a+2b)(5a-2b)/a-2b

计算(3a+2b)(3a-2b)-(a+2b)(5a-2b)/a-2b
原式
=[(3a)²-(2b)²-(5a²-2ab+10ab-4b²)]/(a-2b)
=(9a²-4b²-5a²-8ab+4b²)/(a-2b)
=(4a²-8ab)/(a-2b)
=4a(a-2b)/(a-2b)
=4a