請問各位，這題計算怎麼算?

👨🏻‍🏫 學術台數學

[匿名]

2017-10-16 9:25 pm

*若x的a次方=5，x的b次方=2，則x的(2a次方+3b次方)=?

更新1:

急需!!!!

更新2:

急需!!!!!!!!!! 急需!!!!!!!!!! 急需!!!!!!!!!!

回答 (1)

螞蟻雄兵

2017-10-16 10:14 pm

Sol
x^a=5
x^b=2
x^(2a+3b)
=x^(2a)*x^(3b)
=(x^a)^2*(x^b)^3
=5^2*2^3
=25*8
=200

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