× = | ÷5= | ×12= | × = | ÷ = |
÷ = | × = | 1÷ = | = | 45× = |
÷2= | ÷ = | × = | ÷ = | ×0= |
× = | 1- = | ÷ = | × = | 15÷ = |
× = , | ÷5= , | ×12=10, | × = , | ÷ =1, |
÷ =2, | × =1, | 1÷ = , | = , | 45× =27, |
÷2= , | ÷ = , | × = , | ÷ =2, | ×0=0, |
× = , | 1- = , | ÷ = , | × =1, | 15÷ =75. |
分析:分数乘法:分子相乘的积做分子,分母相乘的积做分母;
分数除法:除以一个数等于乘这个数的倒数.
点评:本题考查了分数乘除法的计算,计算时要细心,注意把结果化成最简分数.
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