Toán Lớp 6: 5^x-1=31+2.(-3) Giúp em nha mn
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Toán Lớp 6: 5^x-1=31+2.(-3) Giúp em nha mn
Comments ( 2 )
5^(x-1)=31+2.(-3)
5^(x-1)=25
5^(x-1)=5^2
⇒x-1=2
⇒x=3
Vậy x=3
$@Masonn$
Giải đáp:
5^x-1=31+(-6)
5^x-1=25
5^x=25+1
5^x=26
=> 5^x = 5^2.024369199
=>x = 2.024369199 ~2