a) tìm giá trị nhỏ nhất của biểu thức A=|x+19|+|y-5|+1890 C=(x-8)^2-2018 b) tìm giá trị lớn nhất của biểu thức B=-|x-7|-|y+13|+1945 D=-(x+5)^2+9

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EXERCISE 2: Rewrite these sentences : 1. Shall we use gas instead of burning coal ? I suggest …………………………………………….. 2. Shall we play badminton ? How …………………………………………………………………. 3. What about buying energy-saving bulbs ? Shall ………………………………………………… 4. Let’s use electricity economically. Why don’t ………………………………………………….. 5. Why don’t you ask her yourself ? I suggest you ………………………………………………… 6. I suggest decorating our classroom again. →I suggest our ………………………………………………………… 7. What about organizing a charity event to raise money ? I suggest a charity …………………………………………………………………………… 8. I suggest that helmet should be used to protect our heads. What ………………………………………………………………………………………… 9. Let’s organize a cultural festival to celebrate Lunar New Year. I suggest a …………………………………………………………………………………… 10. I suggest unused clothes should be collected for the victims. →What about ……………………………………… 11. “Why not take the garbage to recycling centers ?” said the local authorities. The local authorities suggested garbage ……………………………………………………… 12. “Shall we go to the English speaking club ?” Andrew said. Andrew suggested …………………………………………………………………………… 13. “Why don’t you put an advertisement in this local newspaper ?” they said to me. They suggested that an advertisement ………………………………………………………… 14. “Why don’t you repair the electric fan, Nam” Ba asked. →Ba suggested ………………………………………… 15. “Let’s not tell anyone until we are certain that the report is true”, said Tom. Tom suggested ……………………………………………………………………………………