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五、分数四则混合运算分数四则混合运算1： 3/8 12 1/2 9/20 36 2/3 2/5 1/6 1/1002： 5/12+2/3×3/4 = 5/12+1/2 = 5/12+6/12 = 11/12 3÷（5/7－3/14） = 3÷（10/14－3/14） = 3÷1/2 = 6 （28+2/7×7/8）×1/4 =（28+1/4）×1/4 = 28×1/4+1/4×1/4 =3：（3/5+1/3）×15 = 3/5×15+1/3×15 = 9+5 = 14 7/13×4/5+6/13÷5/4 = 7/13×4/5+6/13×4/5 = 4/5×（7/13+6/13） = 4/5×  | 