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3 1/4 - 1 1/5 + 2,5 = 13/4 - 6/5 + 25/10
= 65 - 24 + 50/20
= 91/20
= 4 11/20
Nomor 5
80% : 1 1/4 x 5/8 = 80/100 : 5/4 x 5/8
= 80/100 x 4/5 x 5/8
= 2/5
Nomor 6
JPP = 45 x 1/1.800.000
= 2,5 cm
Nomor 7
3/4 ; 5/8 ; 71% ; 0,9 = 0,75 ; 0,625 ; 0,71 ; 0,9
= 0,9 ; 3/4 ; 71% ; 5/8