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2014-09-04T19:43:44+07:00
N x 1,5 = 0,75
n x 15/10 = 75/100
n x 3/2 = 3/4
n = 3/4 : 3/2
n = 3/4 x 2/3
n = 1/2
n = 0,5
1 5 1
2014-09-04T19:48:49+07:00
15 n/10  = 75/100
15n/10 = 3/4
n = 1/2