六年级数学!简便运算~~分数除法~~(2)
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六年级数学!简便运算~~分数除法~~(2)
10除于5/9+1/6X4(要用递等式~~~)
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7/9除于11/5+2/9X5/11
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(1/12+1/2-7/12)除于1/7
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10除于5/9+1/6X4(要用递等式~~~)
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=
=
7/9除于11/5+2/9X5/11
=
=
=
(1/12+1/2-7/12)除于1/7
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![六年级数学!简便运算~~分数除法~~(2)](/uploads/image/z/7016439-39-9.jpg?t=%E5%85%AD%E5%B9%B4%E7%BA%A7%E6%95%B0%E5%AD%A6%21%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%7E%7E%E5%88%86%E6%95%B0%E9%99%A4%E6%B3%95%7E%7E%282%29)
10除于5/9+1/6X4(要用递等式~)
= 10×9/5+4/6
= 18+2/3
= 18又2/3
7/9除于11/5+2/9X5/11
= 7/9×5/11+2/9×5/11
= (7/9+2/9)×5/11
= 1×5/11
=5/11
(1/12+1/2-7/12)除于1/7
= (1/12+1/2-7/12)×7
= 1/12×7+1/2×7-7/12×7
= 7/12+7/2-49/12
=3又1/2
(你这题中的-7/12应该是-1/12吧?)
= 10×9/5+4/6
= 18+2/3
= 18又2/3
7/9除于11/5+2/9X5/11
= 7/9×5/11+2/9×5/11
= (7/9+2/9)×5/11
= 1×5/11
=5/11
(1/12+1/2-7/12)除于1/7
= (1/12+1/2-7/12)×7
= 1/12×7+1/2×7-7/12×7
= 7/12+7/2-49/12
=3又1/2
(你这题中的-7/12应该是-1/12吧?)