题目内容
(2012?万州区)计算:
9-5.4=780÷26=3.14×3=27×
=
625-199=10+0.1=0÷
=9.42×0.1=
-
=0.42=1÷
=1-
+
=
9-5.4=780÷26=3.14×3=27×
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625-199=10+0.1=0÷
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分析:625-199运用凑整法简算;0÷
根据0除以任何非0的数都得0计算;0.42=0.4×0.4由此求解;1-
+
按照从左到右的顺序计算,如果没有学过负数的加减法,可以运用加法交换律,先算1+
,再算减法;其它题目根据运算法则直接求解.
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解答:解:9-5.4=3.6,780÷26=30,3.14×3=9.42,27×
=15,
625-199=426,10+0.1=10.1,0÷
=0,9.42×0.1=0.942,
-
=
,0.42=0.16,1÷
=
,1-
+
=
;
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625-199=426,10+0.1=10.1,0÷
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点评:本题考查了基本的计算,要注意分析式中数据,运用合适的简便方法计算.
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