题目内容
计算下面各题,能简算的要简算.
(1)912÷57×45+180
(2)
×
+
÷
(3)38.5-15.38+61.25-4.62
(4)
×[
+(
-
)].
(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)
×
+
÷
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)38.5-15.38+61.25-4.62,
=38.5+61.25-(15.38+4.62),
=99.75-20,
=79.75;
(4)
×[
+(
-
)],
=
×(
+
-
),
=
×(
+
-
),
=
×1,
=
.
=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 |
=
| 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 |
=
| 7 |
| 9 |
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