题目内容
神思妙算对又巧.
| ①85.87-(5.87+2.9) | ②(
|
①85.87-(5.87+2.9),
=85.87-5.87-2.9,
=80-2.9,
=77.1;
②(
+
)×13×29,
=(
+
)×(13×29),
=
×13×29+
×29×13,
=1×29+3×13,
=29+39,
=68.
=85.87-5.87-2.9,
=80-2.9,
=77.1;
②(
| 1 |
| 13 |
| 3 |
| 29 |
=(
| 1 |
| 13 |
| 3 |
| 29 |
=
| 1 |
| 13 |
| 3 |
| 29 |
=1×29+3×13,
=29+39,
=68.
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