Question

tìm STN n, biết

3n . 32 = 81                          343 : 7n = 49

Answer 1

\(3n.32=81\)

\(n.32=81:3\)

\(n.32=27\)

\(\Rightarrow x=\dfrac{27}{32}\)

\(343:7n=49\)

\(7n=343:49\)

\(7n=7\)

\(\Rightarrow x=1\)

 

Answer 2

3n . 32=81
3n       =81/32
3n       =81/32
n         =81/32 : 3
n         =27/32

343 : 7n = 49
7n          = 343 : 49
7 n         = 7
7 n         = 7:7
n            =  1
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Answer 3

\(3n\cdot32=81\)

\(3n=\dfrac{81}{32}\)

\(n=\dfrac{81}{32}:3\)

\(n=\dfrac{81}{32}\cdot\dfrac{1}{3}\)

`=>n=27/32`

 

\(343:7n=49\)

\(7n=\dfrac{343}{49}\)

\(7n=7\)

`=>n=7/7=1`