题目内容
62.8×19-8×62
-62
;
1800-1350÷18×6;
(2
+1
+2
+3.375)×
;
1.9-1.9×(1.9-1.9).
| 4 |
| 5 |
| 4 |
| 5 |
1800-1350÷18×6;
(2
| 5 |
| 12 |
| 5 |
| 8 |
| 7 |
| 12 |
| 3 |
| 20 |
1.9-1.9×(1.9-1.9).
(1)62.8×19-8×62
-62
,
=62.8×19-8×62.8-62.8,
=62.8×(19-8-1),
=62.8×10,
=628;
(2)1800-1350÷18×6,
=1800-1350÷9÷2×6,
=1800-75×6,
=1800-450,
=1350;
(3)(2
+1
+2
+3.375)×
,
=[(2
+2
)+(1.625+3.375)]×
,
=[5+5]×
,
=10×
,
=1.5;
(4)1.9-1.9×(1.9-1.9),
=1.9-1.9×0,
=1.9-0,
=1.9.
| 4 |
| 5 |
| 4 |
| 5 |
=62.8×19-8×62.8-62.8,
=62.8×(19-8-1),
=62.8×10,
=628;
(2)1800-1350÷18×6,
=1800-1350÷9÷2×6,
=1800-75×6,
=1800-450,
=1350;
(3)(2
| 5 |
| 12 |
| 5 |
| 8 |
| 7 |
| 12 |
| 3 |
| 20 |
=[(2
| 5 |
| 12 |
| 7 |
| 12 |
| 3 |
| 20 |
=[5+5]×
| 3 |
| 20 |
=10×
| 3 |
| 20 |
=1.5;
(4)1.9-1.9×(1.9-1.9),
=1.9-1.9×0,
=1.9-0,
=1.9.
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