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21. 3/4 x 0,5 + 25% = 3/4 x 1/2 = 3/8 + 25/100 = 5/8
22. 5 3/5 : 3/5 + 6/7 = 28/5 x 5/3 = 28/3 + 6/7 = 214/21 = 10 4/21
nomor1=a
nomor22=a