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1,5 2,5
x 21,1
1,5 / x = 2,5 / 21,1
kali silang
2,5 x = 21,1 . 1,5
2,5 x = 31,65
x= 12,66
x=21,1m
x=21,1x1,5/2,5
x=12,66sak