Toán Lớp 7: 3. $2^{x+1}$ – $2^{x}$ =40
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Toán Lớp 7: 3. $2^{x+1}$ – $2^{x}$ =40
mn giúp em,em đang rất gấp
Comments ( 2 )
=>3.2^x . 2-2^x=40
=>6.2^x-2^x=40
=>2^x . (6-1)=40
=>2^x . 5=40
=>2^x=40:5
=>2^x=8
=>2^x=2^3
=>x=3
Vậy x=3