Question

[Lê Trần Như Uyên]

tim x biet

a)2^x = 64

b)3^x-1=81

cac ban nho ghi cach giai nhe!thanhks

Answer 1

[Feliks Zemdegs]

a)2^x=64

2^x=2⁶

=>x=6

Vậy x =6

b)3^x-1=81

3^x-1=3⁴

=>x-1=4

x=1+4

x=5

Vậy x=5