五 分数四则混合运算分数四则混合运算1: 2/3×3/5+4/5 = 2/5+4/5 = 6/5(5/6-3/4)÷1/15= 1/12×15= 5/4 (1-5/6×3/5)÷4=(1-1/2)×1/4= 1/2×1/4= 1/82: 9/10×5/12+4/7+3/7= 3/8+(4/7+3/7)= 3/8+1= 11/8 5/8×5/9+3/8×5/9= 5/9×(5/8+3/8)= 5/9×1= 5/9 13/10÷7+13/10×6/7= 13/10×1/7+13/10×6/7 = 13/10×(1/7 |