题目内容
能简算的要简算：
（
+
-10%）×21
×53%+60%×0.472
-（20%+
）×4.5．
（
| 2 |
| 7 |
| 2 |
| 3 |
| 3 |
| 5 |
| 3 |
| 4 |
| 1 |
| 3 |
（
+
-10%）×21
=
×21+
×21-0.1×21
=6+14-2.1
=17.9；
×53%+60%×0.47
=0.6×0.53+0.6×0.47
=0.6×（0.53+0.47）
=0.6×1
=0.6；
2
-（20%+
）×4.5
=2
-（
+
）×4.5
=2
-
×4.5
=2
-
=
．
| 2 |
| 7 |
| 2 |
| 3 |
=
| 2 |
| 7 |
| 2 |
| 3 |
=6+14-2.1
=17.9；
| 3 |
| 5 |
=0.6×0.53+0.6×0.47
=0.6×（0.53+0.47）
=0.6×1
=0.6；
2
| 3 |
| 4 |
| 1 |
| 3 |
=2
| 3 |
| 4 |
| 1 |
| 5 |
| 1 |
| 3 |
=2
| 3 |
| 4 |
| 8 |
| 15 |
=2
| 3 |
| 4 |
| 12 |
| 5 |
=
| 7 |
| 20 |
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