题目内容

怎样简便就怎样算.
7×(
2
7
+
3
8
)×8
1
5
÷9+
1
5
÷
9
8
0.32×6.7+3.2×0.33
4
9
×[
3
4
-(
3
16
+
1
4
)].
(1)7×(
2
7
+
3
8
)×8,
=7×8×
2
7
+7×8×
3
8

=16+21,
=37;

(2)
1
5
÷9+
1
5
÷
9
8

=
1
5
×
1
9
+
1
5
×
8
9

=(
1
9
+
8
9
)×
1
5

=1×
1
5

=
1
5


(3)0.32×6.7+3.2×0.33,
=3.2×0.67+3.2×0.33,
=(0.67+0.33)×3.2,
=1×3.2,
=3.2;

(4)
4
9
×[
3
4
-(
3
16
+
1
4
)],
=
4
9
×[
3
4
-
1
4
-
3
16
],
=
4
9
×[
1
2
-
3
16
],
=
4
9
×
5
16

=
5
36
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