﹙a+b﹚﹙a-b﹚+﹙4ab³-8a²b²﹚÷4ab
=a²-b²+4ab(b²-2ab)÷4ab
=a²-b²+b²-2ab
=a²-2ab
=2²-2x2x1
=4-4
=0
﹙a+b﹚﹙a-b﹚+﹙4ab³-8a²b²﹚÷4ab,其中a=2,b=1
﹙a+b﹚﹙a-b﹚+﹙4ab³-8a²b²﹚÷4ab,其中a=2,b=1
数学人气:985 ℃时间:2020-02-02 14:47:35
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