题目内容

计算下面各题,能简算的要简算.
①630÷18×24②0.7+3.9+4.3+6.1③16×
2
5
+4×
2
5
④(7.5-7.5×0.6)÷4⑤(
9
20
+
9
10
÷3)×
1
6
8
15
×[
5
6
÷(
7
9
-
1
3
)]
①630÷18×24,
=35×24,
=840;


②0.7+3.9+4.3+6.1,
=(0.7+4.3)+(6.1+3.9),
=5+10,
=15;
③16×
2
5
+4×
2
5

=(16+4)×
2
5

=20×
2
5

=8;

④(7.5-7.5×0.6)÷4,
=(7.5-4.5)÷4,
=3÷4,
=0.75;

⑤(
9
20
+
9
10
÷3)×
1
6

=(
9
20
+
9
10
×
1
3
)×
1
6

=(
9
20
+
6
20
)×
1
6

=
15
20
×
1
6

=
1
8


8
15
×
[
5
6
÷
7
9
-
1
3
)],
=
8
15
×[
5
6
÷(
7
9
-
3
9
)],
=
8
15
×[
5
6
÷
4
9
],
=
8
15
×
[
5
6
×
9
4
],
=
8
15
×
15
8

=1.
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