题目内容

用简便方法计算,并写出简算过程.
246+78.5+254+21.5
0.125×2.5×320
36×(
2
3
-
1
4
+
1
9
7
24
×0.2+
17
24
÷5.
(1)246+78.5+254+21.5
=(246+254)+(78.5+21.5),
=500+100,
=600;

(2)0.125×2.5×320
=0.125×2.5×80×4,
=(0.125×80)×(2.5×4),
=10×10,
=100;

(3)36×(
2
3
-
1
4
+
1
9

=36×
2
3
-36×
1
4
+36×
1
9

=24-9+4,
=19;

(4)
7
24
×0.2+
17
24
÷5
=
7
24
××
1
5
+
17
24
×
1
5

=(
7
24
+
17
24
)×
1
5

=1×
1
5

=
1
5
练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网