题目内容
神机妙算细又巧.
+
×(
-
)
×[
÷(
-
)]
+
+
+…+
12×(
+
)×25.
| 1 |
| 13 |
| 12 |
| 13 |
| 5 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
| 9 |
| 10 |
| 7 |
| 16 |
| 1 |
| 4 |
| 1 |
| 128 |
| 1 |
| 64 |
| 1 |
| 32 |
| 1 |
| 4 |
12×(
| 5 |
| 12 |
| 7 |
| 25 |
(1)
+
×(
-
),
=
+
×
,
=
+2,
=2
;
(2)
×[
÷(
-
)],
=
×[
÷
],
=
×
,
=3
;
(3)
+
+
+…+
,
=
-
+
-
…+
-
+
-
+
-
,
=
-
,
=
;
(4)12×(
+
)×25,
=12×25×
+12×25×
,
=125+84,
=209.
| 1 |
| 13 |
| 12 |
| 13 |
| 5 |
| 2 |
| 1 |
| 3 |
=
| 1 |
| 13 |
| 12 |
| 13 |
| 13 |
| 6 |
=
| 1 |
| 13 |
=2
| 1 |
| 13 |
(2)
| 2 |
| 3 |
| 9 |
| 10 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 2 |
| 3 |
| 9 |
| 10 |
| 3 |
| 16 |
=
| 2 |
| 3 |
| 24 |
| 5 |
=3
| 1 |
| 5 |
(3)
| 1 |
| 128 |
| 1 |
| 64 |
| 1 |
| 32 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 32 |
| 1 |
| 32 |
| 1 |
| 64 |
| 1 |
| 64 |
| 1 |
| 128 |
=
| 1 |
| 2 |
| 1 |
| 128 |
=
| 63 |
| 128 |
(4)12×(
| 5 |
| 12 |
| 7 |
| 25 |
=12×25×
| 5 |
| 12 |
| 7 |
| 25 |
=125+84,
=209.
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