问题
计算题
已知an=2,求(2a3n)2﹣3(a2)2n÷a2n的值.
答案
解:(2a3n)2﹣3(a2)2n÷a2n,
=4a6n﹣3a4n÷a2n,
=4a6n﹣3a2n,
=4(an)﹣3(an)2,
an=2时,原式=4×26﹣3×22=244.
已知an=2,求(2a3n)2﹣3(a2)2n÷a2n的值.
解:(2a3n)2﹣3(a2)2n÷a2n,
=4a6n﹣3a4n÷a2n,
=4a6n﹣3a2n,
=4(an)﹣3(an)2,
an=2时,原式=4×26﹣3×22=244.