题目内容
用简便方法计算.
0.814-12.34-1.1913-0.16-10.84.
0.814-12.34-1.1913-0.16-10.84.
分析:通过观察,此题如果一步步计算很繁琐,因此可运用减法的性质变成0.814-(12.34+0.16)-(1.1913+10.84),求出括号内的结果后,再次运用减法的性质简算.
解答:解:0.814-12.34-1.1913-0.16-10.84
=0.814-(12.34+0.16)-(1.1913+10.84)
=0.814-12.5-12.0313
=0.814-(12.5+12.0313)
=0.814-24.5313
=-23.7173.
=0.814-(12.34+0.16)-(1.1913+10.84)
=0.814-12.5-12.0313
=0.814-(12.5+12.0313)
=0.814-24.5313
=-23.7173.
点评:仔细观察,找到解决问题的捷径,运用运算性质进行简算.
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