题目内容
脱式计算,能简算的要简算(其中第一小题,先请你在□里填上一个合适的数,使这个算式可以用简便方法计算,再计算出来)
①□×(
-
)
②
×
+
÷
③
+
÷4-
④7.25-3
+3.75-6
.
①□×(
| 5 |
| 6 |
| 3 |
| 4 |
②
| 1 |
| 7 |
| 3 |
| 5 |
| 6 |
| 7 |
| 5 |
| 3 |
③
| 5 |
| 8 |
| 1 |
| 2 |
| 1 |
| 4 |
④7.25-3
| 3 |
| 7 |
| 4 |
| 7 |
①□×(
-
),
=12×(
-
),
=12×
-12×
,
=10-9,
=1;
②
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
③
+
÷4-
,
=
+
×
-
,
=
+
-
,
=
-
,
=
;
④7.25-3
+3.75-6
,
=(7.25+3.75)-(3
+6
),
=11-10,
=1.
| 5 |
| 6 |
| 3 |
| 4 |
=12×(
| 5 |
| 6 |
| 3 |
| 4 |
=12×
| 5 |
| 6 |
| 3 |
| 4 |
=10-9,
=1;
②
| 1 |
| 7 |
| 3 |
| 5 |
| 6 |
| 7 |
| 5 |
| 3 |
=
| 1 |
| 7 |
| 3 |
| 5 |
| 6 |
| 7 |
| 3 |
| 5 |
=(
| 1 |
| 7 |
| 6 |
| 7 |
| 3 |
| 5 |
=1×
| 3 |
| 5 |
=
| 3 |
| 5 |
③
| 5 |
| 8 |
| 1 |
| 2 |
| 1 |
| 4 |
=
| 5 |
| 8 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 4 |
=
| 5 |
| 8 |
| 1 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 4 |
| 1 |
| 4 |
=
| 1 |
| 2 |
④7.25-3
| 3 |
| 7 |
| 4 |
| 7 |
=(7.25+3.75)-(3
| 3 |
| 7 |
| 4 |
| 7 |
=11-10,
=1.
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