| 343-289= | 32+82= | 1322-199= | 49× = | 1-3÷7= |
| 5×4×2= | 6÷2%= | 1.87+5.13= | ÷6= | ×4× = |
| 9.9÷0.1= | 0.35×200= | 0.32-0.22= | ×25= | + ×16= |
| 2.8×25+12= | 41+25= | 1- = | ÷ = | 1-2× = |
| 解:343-289=54, | 32+82=73, | 1322-199=1123, | 49× = , | 1-3÷7= , |
| 5×4×2=40, | 6÷2%=300, | 1.87+5.13=7, | ÷6= , | ×4× = , |
| 9.9÷0.1=99, | 0.35×200=70, | 0.32-0.22=0.05, | ×25=20, | + ×16=4 , |
| 2.8×25+12=82, | 41+25=66, | 1- = , | ÷ =2, | 1-2× = . |
分析:本题根据整数、分数及小数的加法、减法、乘法、除法运算法则计算即可.
1322-199可据凑整法计算;
2.8×25+12可将2.8拆分为4×0.7计算.
点评:完成本题要细心分析式中数据,然后快速准确得出答案.
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