问题 解答题
脱式计算:
(21.9-8.4×2.5)÷3;
326+9664÷32×12;
11
15
-
2
3
)÷
5
8
×
2
5

1
6
÷[
9
14
×(
5
6
-
4
9
)].
答案

(1)(21.9-8.4×2.5)÷3,

=(21.9-21)÷3,

=0.9÷3,

=0.3;

(2)326+9664÷32×12,

=326+302×12,

=326+3624,

=3950;

(3)(

11
15
-
2
3
)÷
5
8
×
2
5

=

1
15
×
8
5
×
2
5

=

8
75
×
2
5

=

16
375

(4)

1
6
÷[
9
14
×(
5
6
-
4
9
)],

=

1
6
÷[
9
14
×
14
36
],

=

1
6
÷
1
4

=

2
3

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