题目内容

计算下列各题,能简算的要简算:
(1)(4800÷75+36)×12
(2)
2
9
÷[
5
6
×(
4
5
-
2
3
)]
(3)3.8×99+3.8
(4)42×
40
41
(5)(
1
2
+
2
3
-
1
4
)÷
1
24
(6)7.8-3.6+2.2-6.4.
(1)(4800÷75+36)×12,
=(64+36)×12
=100×12,
=1200;

(2)
2
9
÷[
5
6
×(
4
5
-
2
3
)],
=
2
9
÷[
5
6
×(
12
15
-
10
15
)],
=
2
9
÷[
5
6
×
2
15
],
=
2
9
÷
1
9

=
2
9
×9,
=2;

(3)3.8×99+3.8,
=3.8×(99+1)
=3.8×100,
=380;

(4)42×
40
41

=(41+1)×
40
41

=41×
40
41
+
40
41

=40
40
41


(5)(
1
2
+
2
3
-
1
4
)÷
1
24

=
1
2
×24+
2
3
×24-
1
4
×24,
=12+16-6,
=22;

(6)7.8-3.6+2.2-6.4,
=7.8+2.2-(3.6+6.4),
=10-10,
=0.
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