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b. (disamakan penyebut jadi..) 4/5a-15/5a = -11/5a
c. (penyebut ny disamakan lgi) jdi 2/2h + 1/2h= 3/2h
d. (sulit jelasin ny tpi samain penyebut dlu) 1x/x - 1/x = 2x/x
maaf klo salah..