题目内容

简便运算.
1
3
+
1
5
+
1
15
)×105
3
7
×
1
4
+25%×
2
7
+0.25×
1
7
2
3
7
+3
5
9
-3
3
7
+1
4
9
+1
4
7
3.7×99+3.7.
(1)(
1
3
+
1
5
+
1
15
)×105,
=
1
3
×105+
1
5
×105+
1
15
×105,
=35+21+7,
=56+7,
=63;

(2)
3
7
×
1
4
+25%×
2
7
+0.25×
1
7

=
3
7
×
1
4
+
1
4
×
2
7
+
1
4
×
1
7

=(
3
7
+
2
7
+
1
7
)×
1
4

=
6
7
×
1
4

=
3
14


(3)2
3
7
+3
5
9
-3
3
7
+1
4
9
+1
4
7

=(2
3
7
+1
4
7
-3
3
7
)+(1
4
9
+3
5
9
),
=(4-3
3
7
)+5,
=
4
7
+5,
=5
4
7


(4)3.7×99+3.7,
=3.7×(99+1),
=3.7×100,
=370.
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