题目内容
下面各题怎样算简便怎样算.
(1)3643-74+6357-76
(2)19.99÷2
-0.4×9.99
(3)8500÷25
(4)
+
+
+
+
+
+
+
.
(1)3643-74+6357-76
(2)19.99÷2
| 1 |
| 2 |
(3)8500÷25
(4)
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
| 1 |
| 56 |
| 1 |
| 72 |
(1)3643-74+6357-76
=3643+6357-(74+76),
=10000-150,
=9850;
(2)19.99÷2
-0.4×9.99
=19.99×0.4-0.4×9.99
=(19.99-9.99)×0.4,
=10×0.4,
=4;
(3)8500÷25=340;
(4)
+
+
+
+
+
+
+
=
+
+…+
,
=1-
+
-
+…+
-
,
=1-
,
=
.
=3643+6357-(74+76),
=10000-150,
=9850;
(2)19.99÷2
| 1 |
| 2 |
=19.99×0.4-0.4×9.99
=(19.99-9.99)×0.4,
=10×0.4,
=4;
(3)8500÷25=340;
(4)
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
| 1 |
| 56 |
| 1 |
| 72 |
=
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 8×9 |
=1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 8 |
| 1 |
| 9 |
=1-
| 1 |
| 9 |
=
| 8 |
| 9 |
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