题目内容
用简便方法计算 9.17-5.22-1.784 |
16.82+5.9+1.18+4.1 | 25.48-(5.48+9.6) |
分析:①9.17-5.22-1.784,根据减法的运算性质进行简算;
②16.82+5.9+1.18+4.1,应用加法交换律和结合律简算;
③25.48-(5.48+9.6),根据减法的运算性质进行简算.
②16.82+5.9+1.18+4.1,应用加法交换律和结合律简算;
③25.48-(5.48+9.6),根据减法的运算性质进行简算.
解答:解:①9.17-5.22-1.784
=9.17-(5.22+1.784)
=9.17-7.004
=2.166;
②16.82+5.9+1.18+4.1
=(16.82+1.18)+(5.9+4.1)
=18+10
=28;
③25.48-(5.48+9.6)
=25.48-5.48-9.6
=20-9.6
=10.4.
=9.17-(5.22+1.784)
=9.17-7.004
=2.166;
②16.82+5.9+1.18+4.1
=(16.82+1.18)+(5.9+4.1)
=18+10
=28;
③25.48-(5.48+9.6)
=25.48-5.48-9.6
=20-9.6
=10.4.
点评:此题考查的目的是理解掌握减法的运算性质和加法的运算定律,并且能够灵活运用这些运算性质和运算定律进行简便计算.
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