- = | 4÷ = | 7× = | 2- = | ÷ = |
+ = | 10÷ = | 10× = | 3.14×2= | 0÷3.14= |
25× = | 1+ = | ÷ = | × = | + + = |
× = | ( - )×0= | 6÷ = | ( - )×30= | 3.14×4= |
解: - = , | 4÷ =24, | 7× = , | 2- =1 , | ÷ = , |
+ = , | 10÷ =25, | 10× =4, | 3.14×2=6.28, | 0÷3.14=0, |
25× =20, | 1+ =1 , | ÷ =3, | × = , | + + =1 , |
× = , | ( - )×0=0, | 6÷ =9, | ( - )×30=1, | 3.14×4=12.56. |
分析:0÷3.14根据0除以任何不为0的数都得0计算;
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运用加法交换律简算;(
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)×0根据任何数乘0都得0计算;(
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)×30运用乘法分配律简算;其它题目根据运算法则直接求解.点评:本题考查了基本的运算,计算时要细心,注意把结果化成最简分数.
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