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leuyenphuong250801
2 năm trước
Biết rằng phương trình x^4+19x^3+69^2+76x+20=0 có 4 nghiệm phân biệt x1,x2,x3,x4. CMR a/x1+x2+x3+x4<0 b/x1^2+x2^2+x3^2+x4^2<239
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PRACTICE 3: ( feed-fed-fed) 1. My children feed the dog in the zoo every day.  The dog __________________________________________ 2. My children fed the dog in the zoo yesterday.  The dog __________________________________________ 3. My children have fed the dog in the zoo today.  The dog __________________________________________ 4. My children will feed the dog in the zoo tomorrow morning.  The dog __________________________________________ 5. My children can feed the dog in the zoo every day.  The dog __________________________________________ 6. My children have to feed the dog in the zoo every day.  The dog __________________________________________ 7. My children used to feed the dog in the zoo every day.  The dog __________________________________________ 8. My children could feed the dog in the zoo every day.  The dog __________________________________________ 9. My children are going to feed the dog in the zoo tonight.  The dog __________________________________________ 10. My children should feed the dog in the zoo every day.  The dog __________________________________________

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