4^n+2 + 4^n+3 + 4^n+4 +4 ^n+5 = 85 x (2^2016 : 2^2012 )
4^n+2 + 4^n+3 + 4^n+4 +4 ^n+5 = 85 x (2^2016 : 2^2012 )
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4^n+2 + 4^n+3 + 4^n+4 +4 ^n+5 = 85 x (2^2016 : 2^2012 )
Jezebel
Đáp án:
Giải thích các bước giải:
`4^{n+ 2}+ 4^{n+ 3}+ 4^{n+ 4}+ 4^{n+ 5}= 85. (2^2016: 2^2012)`
`4^n. 4^2+ 4^n. 4^3+ 4^n+ 4^4+ 4^n. 4^5= 85. 2^4`
`4^n. (4^2+ 4^3+ 4^4+ 4^5)= 1360`
`4^n. (16+ 64+ 256+ 1024)= 1360`
`4^n. 1360= 1360`
`4^n= 1360: 1360`
`4^n= 1`
`4^n= 4^0`
`→ x= 0`
Bơ
4^n+2+4^n+3+4^n+4+4^n+5=85.(2^2016:2^2012)4^n.4^2+4^n.4^3+4^n+4^4+4^n.4^5=85.2^44^n.(42+43+44+45)=13604n.(42+43+44+45)=13604n.(16+64+256+1024)=13604^n.1360=13604^n=1360:13604^n=14^n=14^n=4^0→x=0\chúc bạn làm bài tốt nhá cho xin hay nhất ạ