问题 解答题
脱式计算,能够简算的一定要简算.
3
8
÷
[(
1
5
+
1
4
)×
3
8
]
4-
4
5
÷4-
4
5
9
1
4
+9.8+9.25×
1
5
25×(4×11)×7
1
12
+
3
5
)÷
1
60
101×120-83-37.
答案

3
8
÷[(
1
5
+
1
4
)×
3
8
],

=

3
8
÷
3
8
÷(
1
5
+
1
4
),

=1÷

9
20

=1×

20
9

=2

2
9

②4-

4
5
÷4-
4
5

=4-

4
5
×
1
4
-
4
5

=4-(

1
5
+
4
5
),

=4-1,

=3;

③9

1
4
+9.8+9.25×
1
5

=9.25×(9.8+0.2),

=9.25×10,

=92.5;

④25×(4×11)×7,

=(25×4)×(11×7),

=100×77,

=7700;

⑤(

1
12
+
3
5
)÷
1
60

=(

1
12
+
3
5
)×60,

=60×

1
12
+
3
5
×60,

=5+36,

=41;

⑥101×120-83-37,

=101×120-(83+37),

=120×(101-1),

=120×100,

=12000.

填空题
单项选择题 A1型题