Toán Lớp 6: Tìm số tụ nhiên x biết: 2$^{x+3}$ -3.$2^{x+1}$ =16
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Toán Lớp 6: Tìm số tụ nhiên x biết: 2$^{x+3}$ -3.$2^{x+1}$ =16
Comments ( 2 )
=>2^x . 2^3-3.2^x . 2=16
=>2^x . 8-6.2^x=16
=>2^x . (8-6)=16
=>2^x . 2=16
=>2^x = 16:2
=>2^x=8
=>2^x=2^3
=>x=3
Vậy x=3