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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