题目

下列解方程中正确的有_______①x+4=﹣3，解得x=﹣②3x﹣5=7x，解得x=③﹣（x﹣1）=﹣（x+1），解得x=3④，解得x=﹣8． 答案：【答案】【解析】将各列一次项系数化简，然后计算求出解，即可作出判断．x+4=﹣3，移项合并得：x=−7，解得：x=−14，错误；②3x−5=7x，移项合并得：4x=−5，解得x=−54，错误；－（x﹣1）=﹣（x+1），去分母得：−2x+2=−x−1，解得x=3，正确；④，去分母得：2x−2−x−2=12−3x，移项合并得：4x=16，解 Good morning! Welcome to our food shop. We have many things on sale. Please come in and have a look.Please look at our ads(广告). Would you like some of them? Some food isn’t on the ads, such as chicken and fish. The chicken is ¥20 a kilo and the fish is ¥25 a kilo.1.The ads are for _____.A. a toy shop B. a clothes shop C. a food shop D. a book shop2.Mr. Green can buy three kilos of eggs with______.A. ¥5.00 B. ¥10.00 C. ¥12.00 D. ¥15.003.If you have only ¥7.00, you can buy ____.A. two bottles of orange juice B. two bottles of milkC. four kilos of bread D. four kilos of oranges4.If you have only ¥60 now, you can buy ____ of apples or ___ of rice.A. 12kilos; 2 bags B. 12 kilos: 3 bagsC. 15kilos; 2 bags D. 15 kilos; 3 bags5.Which is RIGHT according to the passage?A. In the shop, you cannot buy food with ¥3.00.B. This shop doesn’t have fish or chickens.C. You cannot buy any drinks in the shop.D. Fish aren’t on the ads, but you can buy them in the shop.