Toán Lớp 6: tìm n biết
a, 7 mũ n : 7 mũ 4 = 49
b, (n+1) mũ 2 – 2=23
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Toán Lớp 6: tìm n biết
a, 7 mũ n : 7 mũ 4 = 49
b, (n+1) mũ 2 – 2=23
Comments ( 2 )
7^n=7^2. 7^4
7^n=7^6
=>n=6
b)(n+1)^2-2=23
(n+1)^2=23+2
(n+1)^2=25
(n+1)^2=5^2
=>n+1=5
=>n=5-1
=>n=4