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稍复杂的分数乘法实际问题练习(2) 1. (1) 6/11×9/8+9/8×5/11 = 9/8×(6/11+5/11) = 9/8×1 = 9/8 (2)(8-6/13-7/13)×2/7 = [8-(6/13+7/13)]×2/7 = [8-1]×2/7 = 7×2/7 = 2
(3)(5/6+3/4)×12 = 5/6×12+3/4×12 = 10+9 = 19 (4)4/7×1/6+3/7÷6 = 4/7×1/6+3/7×1/6 = 1/6×(4/7+3/7) = 1/6×1 = 1/6 |
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