题目内容

计算下列各题
(1)15×
7
9
÷
5
6
(2)1200-840÷24(3)3+1.5÷2.5÷4
(4)8-4.4×0.25(5)
3
4
-(
5
6
-
3
8
)
(6)(
3
4
-
1
3
)×12÷
5
6
(1)15×
7
9
÷
5
6

=15×
6
5
×
7
9

=18×
7
9

=14;

(2)1200-840÷24
=1200-35,
=1165;

(3)3+1.5÷2.5÷4
=3+1.5÷(2.5×4),
=3+1.5÷10,
=3+0.15,
=3.15;

(4)8-4.4×0.25
=8-1.1×(4×0.25),
=8-1.1×1,
=8-1.1,
=6.9;

(5)
3
4
-(
5
6
-
3
8
)

=
3
4
-
11
24

=
7
24


(6)(
3
4
-
1
3
)×12÷
5
6

=(
3
4
×12-
1
3
×12)×
6
5

=(9-4)×
6
5

=5×
6
5

=6.
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