給2的x次方=5求2的x+2的次方給2的x次方=5求2的2x+1的次方給3的x次方=4求3的2x+1的次方急件謝謝?

👨🏻‍🏫 學術台數學

[匿名]

2016-08-27 9:09 pm

回答 (1)

螞蟻雄兵

2016-08-27 10:32 pm

Sol
1
2^x=5
2^(x+2)
=2^x*2^2
=5*4
=20
2
2^x=5
2^(2x+1)
=2^(2x)*2^1
=(2^x)^2*2
=5^2*2
=50
4
3^x=4
3^(2x+1)
=3^2x*3^1
=(3^x)^2*3
=4^2*3
=48

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