计算(a-1/6b)(2a+1/3b)(3a²+1/12b²)

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计算(a-1/6b)(2a+1/3b)(3a²+1/12b²)

计算(a-1/6b)(2a+1/3b)(3a²+1/12b²)
计算(a-1/6b)(2a+1/3b)(3a²+1/12b²)

计算(a-1/6b)(2a+1/3b)(3a²+1/12b²)
第二个式子提个2出来,然后就是(a+b)(a-b)形式的式子了

(a-1/6b)(2a+1/3b)(3a²+1/12b²)
=2(a²-b²/36)3(a²+b²/36)
=6(a^4-b^4/1296)

(a-1/6b)(2a+1/3b)(3a²+1/12b²)
=6(a-1/6b)(a+1/6b)(a²+1/36b²)
=6(a²-1/36b²)(a²+1/36b²)
=6(a^4-1/1296b^4)