题目内容
简便运算
①
×27+27×
②[2.1-2.1×(2.1-2.1)]÷2.1
③
×5+
×2+
×3
④4-
-
.
①
| 3 |
| 8 |
| 5 |
| 8 |
②[2.1-2.1×(2.1-2.1)]÷2.1
③
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
④4-
| 4 |
| 9 |
| 5 |
| 9 |
①
×27+27×
=(
+
)×27,
=1×27,
=27;
②[2.1-2.1×(2.1-2.1)]÷2.1
=[2.1-2.1×0]÷2.1,
=[2.1-0]÷2.1,
=2.1÷2.1,
=1;
③
×5+
×2+
×3
=(5+2+3)×
,
=10×0.75,
=7.5;
④4-
-
=4-(
+
),
=4-1,
=3.
| 3 |
| 8 |
| 5 |
| 8 |
=(
| 3 |
| 8 |
| 5 |
| 8 |
=1×27,
=27;
②[2.1-2.1×(2.1-2.1)]÷2.1
=[2.1-2.1×0]÷2.1,
=[2.1-0]÷2.1,
=2.1÷2.1,
=1;
③
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
=(5+2+3)×
| 3 |
| 4 |
=10×0.75,
=7.5;
④4-
| 4 |
| 9 |
| 5 |
| 9 |
=4-(
| 4 |
| 9 |
| 5 |
| 9 |
=4-1,
=3.
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