题目内容
用递等式计算,能简算的简算
2506-10517÷13+14×106
[0.8+0.75×(0.65-0.25)]÷0.01
455×7.6+112÷
+43.3×76
+
+
+…+
.
2506-10517÷13+14×106
[0.8+0.75×(0.65-0.25)]÷0.01
455×7.6+112÷
| 5 |
| 38 |
| 1 |
| 1 |
| 1 |
| 1+2 |
| 1 |
| 1+2+3 |
| 1 |
| 1+2+3+…+50 |
(1)2506-10517÷13+14×106,
=2506-809+1484,
=1697+1484,
=3181;
(2)[0.8+0.75×(0.65-0.25)]÷0.01,
=[0.8+0.75×0.4]÷0.01,
=[0.8+0.3]÷0.01,
=1.1÷0.01,
=110;
(3)455×7.6+112÷
+43.3×76,
=455×7.6+112×7.6+433×7.6,
=(455+112+433)×7.6,
=1000×7.6,
=7600;
(4)
+
+
+…+
,
=1+2×(
-
+
-
+
+…+
-
),
=1+2×(
-
),
=1+
,
=
.
=2506-809+1484,
=1697+1484,
=3181;
(2)[0.8+0.75×(0.65-0.25)]÷0.01,
=[0.8+0.75×0.4]÷0.01,
=[0.8+0.3]÷0.01,
=1.1÷0.01,
=110;
(3)455×7.6+112÷
| 5 |
| 38 |
=455×7.6+112×7.6+433×7.6,
=(455+112+433)×7.6,
=1000×7.6,
=7600;
(4)
| 1 |
| 1 |
| 1 |
| 1+2 |
| 1 |
| 1+2+3 |
| 1 |
| 1+2+3+…+50 |
=1+2×(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 50 |
| 1 |
| 51 |
=1+2×(
| 1 |
| 2 |
| 1 |
| 51 |
=1+
| 49 |
| 51 |
=
| 100 |
| 51 |
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