题目内容
计算下列各题．
①1+0.45÷0.9-
②（
-
）×45③
×[0.75-(
-0.25)]．
①1+0.45÷0.9-
| 7 |
| 8 |
| 1 |
| 3 |
| 1 |
| 5 |
| 4 |
| 7 |
| 7 |
| 16 |
①1+0.45÷0.9-
=1+0.5-
，
=1.5-
，
=
；
②（
-
）×45
=
×45-
×45，
=15-9，
=6；
③
×[0.75-(
-0.25)]
=
×[0.75-
]，
=
×
，
=
．
| 7 |
| 8 |
=1+0.5-
| 7 |
| 8 |
=1.5-
| 7 |
| 8 |
=
| 5 |
| 8 |
②（
| 1 |
| 3 |
| 1 |
| 5 |
=
| 1 |
| 3 |
| 1 |
| 5 |
=15-9，
=6；
③
| 4 |
| 7 |
| 7 |
| 16 |
=
| 4 |
| 7 |
| 3 |
| 16 |
=
| 4 |
| 7 |
| 9 |
| 16 |
=
| 9 |
| 28 |
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