cmr: 2x²+4y²+4xy-6x+9 là tổng của 2 số chính phương với mọi x,y thuộc z Giúp mình vs ạ

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IV. Rewrite the following sentences 1. An dictionary is more expensive than an English book. An English book ________________________________________________________________ 2. My uncle is fatter than my father. My father _____________________________________________________________________ 3. Hue to Ha Noi is nearer than HCM City to Ha Noi. HCM City to Ha Noi ____________________________________________________________ 4. My homework is worse than yours. Your homework is ______________________________________________________________ 5. My house is bigger than your house. Your house is __________________________________________________________________ 6. No one in my class is as tall as Tam. Tam is the ________________________________________________________________________ 7. I can’t cook as well as my mother. My mother can cook ________________________________________________________________ 8. He does not play tennis as well as Jack. Jack can__________________________________________________________________________ 9. Let’s visit the beautiful Khmer temples of Angkor Wat this summer  How about __________________________________________________________________ 10. He is a slower and more careful driver than I am  He drives ___________________________________________________________________ 11. How about eating out tonight?  Why don’t we ? 12. Han is a better swimmer than Lan  Lan can’t swim 13. We took a train to HCM city  We got to 14.Lan is the youngest of the tree sister >lan has