题目内容

计算下面各题,能简算的要简算.
(1)912÷57×45+180
(2)
5
7
×
4
5
+
2
7
÷
5
4

(3)38.5-15.38+61.25-4.62
(4)
7
9
×[
3
4
+(
5
6
-
7
12
)]
(1)912÷57×45+180,
=16×45+45×4,
=45×(16+4),
=45×20,
=900;
(2)
5
7
×
4
5
+
2
7
÷
5
4

=
5
7
×
4
5
+
2
7
×
4
5

=
4
5
×(
5
7
+
2
7
),
=
4
5
×1,
=
4
5

(3)38.5-15.38+61.25-4.62,
=38.5+61.25-(15.38+4.62),
=99.75-20,
=79.75;
(4)
7
9
×[
3
4
+(
5
6
-
7
12
)]

=
7
9
×
3
4
+
5
6
-
7
12
),
=
7
9
×(
9
12
+
10
12
-
7
12
),
=
7
9
×1,
=
7
9
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