问题 解答题
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.
答案

(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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