`#laviken#`
`a^3+b^3=(a+b).(a^2-ab+b^2)`
`=(a+b).` `[(a+b)^2-3.ab]`
`=7.(7^2-3.3)`
`=7.40`
`=280`
Vậy `a^3+b^3=280`
꧁𝓎𝒶𝓃𝑔𝓎𝒶𝓃𝑔➈➈➀➈➈➀🌻꧂
Ta có: $a^{3}$ + $b^{3}$
`= (a + b)` ($a^{2}$ `- ab` + $b^{2}$ )
`= (a + b)` ($a^{2}$ `+ 2ab` + $b^{2}$ `- 3ab)`
`= (a + b)` [$(a + b)^{2}$ - `3ab`]
`= 7 .` ($7^{2}$ `- 3 . 3)`
`= 7 . (49 - 9)`
`= 7 . 40`
`= 280`
Ex2. Rewrite the following sentences that keep the same meaning 1. Although Tom was a poor student, he studied very well. In spite of ______________________________________ 2. Although the weather was bad, she went to school on time. Despite ________________________________________ 3. My mother told me to go to school although I was sick. In spite of ______________________________________ 4. Tom was admitted to the university although his grades were bad. Despite ________________________________________ 5. In spite of his good salary, Tom gave up his job. Although _______________________________________ 6. He didn’t win an Oscar for Best Actor although he performed excellently. Despite _______________________________________
giúp tóoooooooooooooooooooooooooooooooooooo
giúp mình với ạ!!!xin cảm ơn :333 #phương trình lượng giác cơ bản
Cho 5 chữ số: 1, 2, 3, 6, 7 có thể lập được bao nhiêu số có 3 chữ số khác nhau?
BT: q1=4.10-8C, q2= - 3.10-8 C, q3 = 10-8C, AB =5cm, ε=1. Xác định F tổng hợp do q1, q2, tác dụng lên q3 đặt tại các vị trí sau. a. M là trung điểm của AB. b.N là điểm thuộc AB sao cho: AN = 5cm, BN = 10 cm. c. C sao cho AC = 4 cm, BC = 3cm
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mng giúp e vs ạ ! e sẽ vote 5 sao :3
8. What ____________ we ____________ (prepare) for dinner? 9. Where ____________ you ____________ (go) for your vacation?
help help help siêu dễ điền vào bảng
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