题目内容
怎样简便就怎样算,并写出主要的简算过程
①78-4.5+22-45
②
-
÷
-
③
÷7+
×
.
①78-4.5+22-45
| 1 |
| 2 |
②
| 9 |
| 8 |
| 3 |
| 13 |
| 9 |
| 26 |
| 1 |
| 3 |
③
| 5 |
| 11 |
| 1 |
| 7 |
| 6 |
| 11 |
①78-4.5+22-45
,
=(78+22)-(4.5+45.5),
=100-50,
=50;
②
-
÷
-
,
=
-
-
,
=
-(
+
),
=
-1,
=
;
③
÷7+
×
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
.
| 1 |
| 2 |
=(78+22)-(4.5+45.5),
=100-50,
=50;
②
| 9 |
| 8 |
| 3 |
| 13 |
| 9 |
| 26 |
| 1 |
| 3 |
=
| 9 |
| 8 |
| 2 |
| 3 |
| 1 |
| 3 |
=
| 9 |
| 8 |
| 2 |
| 3 |
| 1 |
| 3 |
=
| 9 |
| 8 |
=
| 1 |
| 8 |
③
| 5 |
| 11 |
| 1 |
| 7 |
| 6 |
| 11 |
=
| 5 |
| 11 |
| 1 |
| 7 |
| 1 |
| 7 |
| 6 |
| 11 |
=
| 1 |
| 7 |
| 5 |
| 11 |
| 6 |
| 11 |
=
| 1 |
| 7 |
=
| 1 |
| 7 |
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