题目内容
直接填写得数: 234+299= |
7.8+0.32= | 5.6+3.75+6.25= | 15.2+89-5.2= |
420-280= | 6-0.45= | 99×88+88= | 48-0÷48= |
540÷18= | 13.2×100= | 125×29×8= | 6.5+3.5-6.5+3.5= |
160×5= | 3.8÷1000= | 300÷25÷4= | 15×4÷15×4= |
分析:234+299把299分解成300-1再计算;5.6+3.75+6.25运用加法结合律简算;15.2+89-5.2运用加法交换律简算;99×88+88运用乘法分配律简算;48-0÷48先算除法,再算减法;125×29×8运用乘法交换律简算;6.5+3.5-6.5+3.5运用加法结合律简算;300÷25÷4根据连续除以两个数,等于除以这两个数的积简算;15×4÷15×4按照从左到右的顺序计算;其它题目根据运算法则直接求解.
解答:
故答案为:533,8.12,19.41,99,140,5.55,8800,48,30,1320,29000,7,800,0.0038,3,16.
解:234+299=533, | 7.8+0.32=8.12, | 5.6+3.75+6.25=15.6, | 15.2+89-5.2=99, |
420-280=140, | 6-0.45=5.55, | 99×88+88=8800, | 48-0÷48=48, |
540÷18=30, | 13.2×100=1320, | 125×29×8=29000, | 6.5+3.5-6.5+3.5=7, |
160×5=800, | 3.8÷1000=0.0038, | 300÷25÷4=3, | 15×4÷15×4=16. |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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