问题 解答题
脱式计算能简算得要简算.
①1.8÷0.75+9.6÷2.4
②6.7+
7
8
+
9
8
+2.3
③19×(
1
3
+
7
19
)×6
5
7
×
15
4
+3×
5
7
+
5
12
×
3
7
答案

(1)1.8÷0.75+9.6÷2.4,

=2.4+4,

=6.4;

(2)6.7+

7
8
+
9
8
+2.3,

=(6.7+2.3)+(

7
8
+
9
8
),

=9+2,

=11;

(3)19×(

1
3
+
7
19
)×6,

=19×

1
3
×6+19×
7
19
×
6,

=38+42,

=80;

(4)

5
7
×
15
4
+3×
5
7
+
5
12
×
3
7

=

5
7
×(
15
4
+3+
3
12
),

=

5
7
×7,

=5.

单项选择题
单项选择题 A3/A4型题