(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)等于多少?(用平方差公式计算)
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(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)等于多少?(用平方差公式计算)
(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)等于多少?(用平方差公式计算)
(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)等于多少?(用平方差公式计算)
(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)
= { a^2 - (1/2b)^2 } - { (3a)^2-(2b)^2 }
=a^2-1/4b^2-9a^2+4b^2
=-8a^2 + 15/4 b^2
-8a²+15/4b²