Question

Tim x

a.14x-5x=63

b.2^x+2^x+1+2^x+2=112

Answer 1

a. 14x-5x=63

x.(14-5)=63 => 9x=63=> x=7

b. 2^x+2^x+1+2^x+2=112

2^x.(1+2+2²)=112

2^x. 7=112 => 2^x=16=2⁴ => x=4

Answer 2

a)14x-5x=9x=63

=>x=63:9=7

Vậy x=7

b) 2^x+2^x+1+2^x+2=2^x(1+2+2²)=112

2^x.7=112

2^x=112:7=16=2⁴

=> x=4

Vậy x=4