| 8400÷210= | 125×16= | 26.5÷10%= | 3÷ - ÷3= |
1- + = | 78-0.98= | 1.5- = | 0.32= |
× = | ×2÷ ×2= | ×25%= | 3.25-(0.25+ )= |
解:
| 8400÷210=40, | 125×16=2000, | 26.5÷10%=265, | 3÷ - ÷3=8 , |
1- + = , | 78-0.98=77.02, | 1.5- =0.9, | 0.32=0.09, |
× = , | ×2÷ ×2=4, | ×25%=0.2, | 3.25-(0.25+ )=2 . |
分析:根据整数、分数、小数、百分数加减乘除的计算方法进行计算;
.25-(0.25+
)根据连减的性质进行计算.点评:口算时,注意运算符号和数据,然后再进一步计算.
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