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yg ada tanda seperti 4/5 berarti 4 per 5
semoga berhasil
b.3 1/2+1 5/7=7/2+11/7=49/14+22/14=71/14=5 1/4
c.3 1/4-2 3/5=165/20-52/20=113/20=5 13/20