计算:(5a-4b)^2-2(5a-4b)(3a-2b)

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计算:(5a-4b)^2-2(5a-4b)(3a-2b)计算:(5a-4b)^2-2(5a-4b)(3a-2b)计算:(5a-4b)^2-2(5a-4b)(3a-2b)落泪水晶,(5a-4b)^2-2

计算:(5a-4b)^2-2(5a-4b)(3a-2b)
计算:(5a-4b)^2-2(5a-4b)(3a-2b)

计算:(5a-4b)^2-2(5a-4b)(3a-2b)
落泪水晶,
(5a-4b)^2-2(5a-4b)(3a-2b)
=(5a-4b)(5a-4b-6a+4b)
=(5a-4b)(-a)
=-5a^2+4ab

(5a-4b)^2-2(5a-4b)(3a-2b)
=(5a-4b)(5a-4b-3a+2b)
=(5a-4b)(2a-2b)

=(5a-4b)[(5a-4b-2(3a-2b) ]
=(5a-4b)(5a-4b-6a+4b)
=-a(5a-4b)
=4ab-5a^2