问题 解答题
脱式计算(能简算的要简算):
(1)3.5×0.8+7.5×0.8-80%

(2)
1
5
÷3+
4
5
×
1
3
(3)20-(3.84+1.21)×0.4(4)35÷[(
11
6
-
2
3
)×6].
答案

(1)3.5×0.8+7.5×0.8-80%,

=(3.5+7.5-1)×0.8,

=10×0.8,

=8;

(2)

1
5
÷3+
4
5
×
1
3

=(

1
5
+
4
5
)×
1
3

=1×

1
3

=

1
3

(3)20-(3.84+1.21)×0.4,

=20-5.05×0.4,

=20-2.02,

=17.98;

(4)35÷[(

11
6
-
2
3
)×6].

=35÷[

7
6
×6],

=35÷7,

=5.

判断题
单项选择题