问题 解答题
脱式计算.
0.25×
4
5
+2.5%
9.6-11÷7+
1
7
×4
325+75×
2
5
÷
3
7
答案

(1)0.25×
4
5
+2.5%,

=

1
5
+2.5%,

=0.2+0.025,

=0.225;

(2)9.6-11÷7+

1
7
×4,

=9.6-11×

1
7
+
1
7
×4,

=9.6-(11×

1
7
-
1
7
×4),

=9.6-[

1
7
×(11-4)],

=9.6-

1
7
×7,

=9.6-1,

=8.6;

(3)325+75×
2
5
÷
3
7

=325+30÷

3
7

=325+70,

=395.

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