题目内容
| 30 |
| 7 |
| 7 |
| 15 |
| 3 |
| 20 |
| 5 |
| 14 |
13
| 3 |
| 4 |
| 5 |
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
| 5 |
| 8 |
(8
| 5 |
| 12 |
| 4 |
| 7 |
| 4 |
| 7 |
| 7 |
| 12 |
2.5×
| 3 |
| 7 |
| 1 |
| 3 |
①
×(
-
)-
,
=
×
-
,
=
-
,
=1;
②13
×
-2
×
-
,
=
×(13
-2
-1),
=
×10,
=6
;
③(8
+3
)-(
-
),
=9+3,
=12;
④2.5×
×0.4×2
,
=
×
×
×
,
=1
| 30 |
| 7 |
| 7 |
| 15 |
| 3 |
| 20 |
| 5 |
| 14 |
=
| 30 |
| 7 |
| 19 |
| 60 |
| 5 |
| 14 |
=
| 19 |
| 14 |
| 5 |
| 14 |
=1;
②13
| 3 |
| 4 |
| 5 |
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
| 5 |
| 8 |
=
| 5 |
| 8 |
| 3 |
| 4 |
| 3 |
| 4 |
=
| 5 |
| 8 |
=6
| 1 |
| 4 |
③(8
| 5 |
| 12 |
| 4 |
| 7 |
| 4 |
| 7 |
| 7 |
| 12 |
=9+3,
=12;
④2.5×
| 3 |
| 7 |
| 1 |
| 3 |
=
| 5 |
| 2 |
| 3 |
| 7 |
| 2 |
| 5 |
| 7 |
| 3 |
=1
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