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c. 2 : 40.000.000= 1 : 20.000.000
d. 100 : 5.000.000 = 1:50.000
b. bilangannya itu berapa?
c. = 2 mm : 40000000 = 1:20000000
d. = 100 mg : 5000000 = 1 : 50000