题目内容
用简便方法计算，要求写出简算的主要过程．
①
×
×
②（
+
）×56
③
×
+
×
．
①
| 7 |
| 4 |
| 5 |
| 6 |
| 6 |
| 5 |
②（
| 4 |
| 7 |
| 5 |
| 8 |
③
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
①
×
×
，
=
×（
×
），
=
×1，
=
；
②（
+
）×56，
=
×56+
×56，
=32+35，
=67；
③
×
+
×
，
=
×（
+
），
=
×1，
=
．
| 7 |
| 4 |
| 5 |
| 6 |
| 6 |
| 5 |
=
| 7 |
| 4 |
| 5 |
| 6 |
| 6 |
| 5 |
=
| 7 |
| 4 |
=
| 7 |
| 4 |
②（
| 4 |
| 7 |
| 5 |
| 8 |
=
| 4 |
| 7 |
| 5 |
| 8 |
=32+35，
=67；
③
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
=
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 4 |
=
| 3 |
| 5 |
=
| 3 |
| 5 |
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