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TÍNH
a) 7/12 + 1/4 =............................................................. b) 13/15 -3/5 =..................................................................
c) 4/9 x 7/5 + 3 =......................................................... d) 15/7 : 2 =......................................................................
a) 7/12 + 1/4 =............................................................. b) 13/15 -3/5 =..................................................................
c) 4/9 x 7/5 + 3 =......................................................... d) 15/7 : 2 =......................................................................