解方程
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（1）7x-2×9=80
7x-18=80，
7x-18+18=80+18，
7x=98，
7x÷7=98÷7，
x=14；
（2）7+5x=42
7-7+5x=42-7，
5x=35，
5x÷5=35÷5，
x=7；
（3）13x-7.5x=18.7
（13-7.5）x=18.7，
5.5x=18.7，
5.5x÷5.5=18.7÷5.5，
x=3.4；
（4）（32-x）×6=108
（32-x）×6÷6=108÷6，
32-x=18，
32-x+x=18+x，
18+x=32，
18-18+x=32-18，
x=14．
| 选词填空。 | |
2. After a long walk, the little boy got tired and fell ______ soon. 3. The boy is too young to look after ______. 4. I think the computer is one of the most important ______ in the world. 5. The weather report says it will be cloudy in some ______ cities in the coming days. 6.—Hi, Jack! What's wrong with Peter? —He fell off his bike yesterday. Luckily, he was not ______ hurt. 7. My students find English ______ to learn and they like it very much. 8. Kate ______ a beautiful dress at her 18th birthday party yesterday. 9. —These tables are very nice. Which one would you like, madam? —I'd like that brown one. It uses the ______ space. 10.We will arrive at that small village in about one and a half ______ time. |