问题 解答题
计算下列各题,要写出主要计算过程,能用简便方法的要用简便方法计算.
①16×18-120÷15②3.2×2.77+0.23×3.2③7.6-2.05÷0.82
7
8
-
5
17
+
9
8
-
12
17
2
9
-
7
16
×
2
9
⑥13÷(
1
4
+
5
6
)×
3
4
答案

①16×18-120÷15,

=288-8,

=280;

②3.2×2.77+0.23×3.2,

=3.2×(2.77+0.23),

=3.2×3,

=9.6;

③7.6-2.05÷0.82,

=7.6-2.5,

=5.1;

7
8
-
5
17
+
9
8
-
12
17

=(

7
8
+
9
8
)-(
5
17
+
12
17
),

=2-1,

=1;

2
9
-
7
16
×
2
9

=

2
9
×(1-
7
16
),

=

2
9
×
9
16

=

1
8

⑥13÷(

1
4
+
5
6
)×
3
4

=13÷

13
12
×
3
4

=12×

3
4

=9.

单项选择题
单项选择题