问题 解答题
计算下列各题
2
1
7
+1
1
8
×
5
9
+
3
8
68×〔1÷(2
1
10
-2.09)〕
〔(0.75+
1
5
)÷0.25+
2
5
〕×250%
答案

(1)2

1
7
+1
1
8
×
5
9
+
3
8

=2

1
7
+
5
8
+
3
8

=2

1
7
+(
5
8
+
3
8
),

=2

1
7
+1,

=3

1
7

(2)68×〔1÷(2

1
10
-2.09)〕,

=68×〔1÷0.01〕,

=68×100,

=6800;

(3)〔(0.75+

1
5
)÷0.25+
2
5
〕×250%,

=〔0.95÷0.25+

2
5
〕×250%,

=〔3.8+

2
5
〕×250%,

=4.2×250%,

=10.5.

单项选择题 A1/A2型题
单项选择题