| 计算 75× | ×13 | ×![]() | × |
× | ÷![]() | × | × |
÷![]() | × | ÷ | ÷ |
÷ | ÷ | ÷21. |
解:75× =15, | ×13= , | × = , | × = , |
× = , | ÷ = , | × = , | × = , |
÷ = , | × = , | ÷ = , | ÷ = , |
÷ =4, | ÷ = , | ÷21= . |
分析:根据分数乘除法的计算方法直接计算即可.
点评:本题主要考查了分数乘除法的计算方法;分数乘法:分子和分子相乘,分母和分母相乘;分数除法:除以一个数等于乘这个数的倒数;注意把结果化成最简分数.
×13
×
×
×
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×
×
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÷21.
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