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pake cara (a/b)+(c/d) = (ad + bc) / bd
jadi [(15p .15) + (20.9p) ]/ 20.15
= (225p + 180p) / 300 = 405p/300 = 27p/20
2. bentuk sederhana (5/x+3) + (6/x+4)
=[(5. x+4) + (6. x+3)] /(x+3 .x+4)
=(5x +20)+(6×+18) / (×+3)(×+4)
=11× + 38 / (×+3)(×+4)