题目内容
简便计算
①504-(304-167)
②20.8×7-0.8×7
③
-
+
.
①504-(304-167)
②20.8×7-0.8×7
③
| 19 |
| 30 |
| 3 |
| 7 |
| 11 |
| 30 |
①504-(304-167)
=504-304+167,
=267;
②20.8×7-0.8×7
=(20.8-0.8)×7,
=20×7,
=140;
③
-
+
.
=
+
-
,
=1-
,
=
.
=504-304+167,
=267;
②20.8×7-0.8×7
=(20.8-0.8)×7,
=20×7,
=140;
③
| 19 |
| 30 |
| 3 |
| 7 |
| 11 |
| 30 |
=
| 19 |
| 30 |
| 11 |
| 30 |
| 3 |
| 7 |
=1-
| 3 |
| 7 |
=
| 4 |
| 7 |
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