题目内容

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
)].
(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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