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2 5/8 jadikan pecahan asli = 8x2+5 = 21 /8
tambahkan dan samakan penyebutnya 8
21/8 + 54/8 = 75/8
2.4 7/10 jadikan pecahan asli = 10x4+7 = 47/10
1 5/8 jadikan pecahan asli = 8x1+5 = 13/8
kurangkan dan samakn penyebutnya 40
65/40 - (-188/40 ) = 65/40 + 188/40 = 253/40