简便运算.(13+15+115)×10537×14+25%×27+0.25×17237+359-337+149+1473.7×99+3.7.-数学

题文

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.
题型:解答题  难度:中档

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