题目内容
(2012?北京)(1)18×0.55+18×0.45
(2)
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.
(2)
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分析:(1)18×0.55+18×0.45,运用乘法分配律进行简算.
(2)
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.应用减法的运算性质进行简算.
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解答:解:(1)18×0.55+18×0.45,
=18×(0.55+0.45),
=18×1,
=18;
(2)
-
-
,
=
-(
+
),
=
-
,
=
.
=18×(0.55+0.45),
=18×1,
=18;
(2)
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=
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=
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=
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点评:此题考查的目的是运用运算定律和运算性质对小数、分数四则混合运算进行简便计算.
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