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第五单元 分数四则混合运算分数四则混合运算1. 5/8 7/12 10/7 1/72. 原式=1/3+2/3×4/3=11/9 原式=2/5×1/12=1/30 原式=6/5-4/5×7/8=1/23. 42×(1/6+1/7) = 42×1/6+42×1/7= 7+6= 13 2/3×1/4+2/3÷4=2/3×1/4+2/3×1/4= (2/3+2/3)×1/4= 4/3×1/4= 1/3 8/9×2/5+8/9×3/5=8/9×(2/5+3/5)= 8/9×1= 8/9 11/8-(5/16×6/5+2/7)=11/8-(3/8+2/7)=11/8-3/8-2/7=1-2/7= 5/7 2/9÷1/5+7/9÷1/5=(2  | 