题目内容

用简便方法计算下列各题.
①2.84×
3
7
+4.16÷
7
3

②38×
1
4
+17×0.25+45×25%
③0.125×32×2.5
④72×(
5
9
-
5
12
)+10.
①2.84×
3
7
+4.16÷
7
3

=(2.84+4.16)×
3
7

=7×
3
7

=3;
②38×
1
4
+17×0.25+45×25%,
=(38+17+45)×0.25,
=100×0.25,
=25;
③0.125×32×2.5,
=(0.125×8)×(4×2.5),
=1×10,
=10;
④72×(
5
9
-
5
12
)+10,
=72×
5
9
-72×
5
12
+10,
=40-30+10,
=20.
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