整式运算(a-1)(a+1)(a²+1) (-3ab²+2a²b)(3ab²+2a²b) (1-xy)(-xy-1)

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整式运算(a-1)(a+1)(a²+1)(-3ab²+2a²b)(3ab²+2a²b)(1-xy)(-xy-1)整式运算(a-1)(a+1)(a

整式运算(a-1)(a+1)(a²+1) (-3ab²+2a²b)(3ab²+2a²b) (1-xy)(-xy-1)
整式运算(a-1)(a+1)(a²+1) (-3ab²+2a²b)(3ab²+2a²b) (1-xy)(-xy-1)

整式运算(a-1)(a+1)(a²+1) (-3ab²+2a²b)(3ab²+2a²b) (1-xy)(-xy-1)
(a-1)(a+1)(a²+1)
=(a²-1)(a²+1)
=a^4-1
(-3ab²+2a²b)(3ab²+2a²b)
=4a^4b²-9a²b^4
(1-xy)(-xy-1)
=-(1-xy)(1+xy)
=-(1-x²y²)
=x²y²-1

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