题目内容
脱式计算.(能简算的要简算)
(1)[1-(
+
)]×32
(2)2.5×28
(3)
-
-
.
(1)[1-(
| 1 |
| 4 |
| 1 |
| 8 |
(2)2.5×28
(3)
| 5 |
| 3 |
| 21 |
| 37 |
| 16 |
| 37 |
(1)[1-(
+
)]×32,
=1×32-
×32-
×32,
=32-8-4,
=20;
(2)2.5×28,
=(2.5×4)×7,
=10×7,
=70;
(3)
-
-
,
=
-(
+
),
=
-1,
=
.
| 1 |
| 4 |
| 1 |
| 8 |
=1×32-
| 1 |
| 4 |
| 1 |
| 8 |
=32-8-4,
=20;
(2)2.5×28,
=(2.5×4)×7,
=10×7,
=70;
(3)
| 5 |
| 3 |
| 21 |
| 37 |
| 16 |
| 37 |
=
| 5 |
| 3 |
| 21 |
| 37 |
| 16 |
| 37 |
=
| 5 |
| 3 |
=
| 2 |
| 3 |
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