题目内容
脱式计算,能简算的要简算.
①0.25×
+
×25%
②
÷(1-
×
)
③(84%÷3+8.72)×(1-
)
④12×(
-
)
①0.25×
| 75 |
| 31 |
| 49 |
| 31 |
②
| 7 |
| 10 |
| 3 |
| 4 |
| 2 |
| 5 |
③(84%÷3+8.72)×(1-
| 1 |
| 9 |
④12×(
| 1 |
| 2 |
| 3 |
| 4 |
①0.25×
+
×25%
=
×
+
×
=
×(
+
)
=
×4
=1;
②
÷(1-
×
)
=
÷(1-
)
=
÷
=1;
③(84%÷3+8.72)×(1-
)
=(0.84÷3+8.72)×
=(0.28+8.72)×
=9×
=9;
④12×(
-
)
=12×
-12×
=6-9
=-3.
| 75 |
| 31 |
| 49 |
| 31 |
=
| 1 |
| 4 |
| 75 |
| 31 |
| 49 |
| 31 |
| 1 |
| 4 |
=
| 1 |
| 4 |
| 75 |
| 31 |
| 49 |
| 31 |
=
| 1 |
| 4 |
=1;
②
| 7 |
| 10 |
| 3 |
| 4 |
| 2 |
| 5 |
=
| 7 |
| 10 |
| 3 |
| 10 |
=
| 7 |
| 10 |
| 7 |
| 10 |
=1;
③(84%÷3+8.72)×(1-
| 1 |
| 9 |
=(0.84÷3+8.72)×
| 8 |
| 9 |
=(0.28+8.72)×
| 8 |
| 9 |
=9×
| 8 |
| 9 |
=9;
④12×(
| 1 |
| 2 |
| 3 |
| 4 |
=12×
| 1 |
| 2 |
| 3 |
| 4 |
=6-9
=-3.
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