题目内容
直接写出得数.
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12÷
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3.14×42=(
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分析:
×60,注意60和4约分;12÷
,先改为乘法,然后约分;3.14×42,先算42=16,再算3.14×16;
(
)2,分子、分母分别平方;
×
,注意约分;
+
,通分化为同分母分数;
÷
,
÷
,改写成乘法,再计算.
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解答:解:
×60=15; 12÷
=20; 3.14×42=50.24; (
)2 =
;
×
=
;
+
=
;
÷
=
;
÷
=2.
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点评:此题考查了分数的乘法和除法以及乘方的运算方法,掌握它们的运算法则是解题的关键.
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