Đáp án+Giải thích các bước giải:
`a)`
`A=(2020^(3)+1)/(2020^(2)-2019)`
`=[(2020+1)(2020^(2)-2020.1+1^2)]/(2020^(2)-2019)`
`=[2021.(2020^(2)-2019)]/(2020^(2)-2019)`
`=2021`
Áp dụng hằng đẳng thức : `a^(3)+b^3=(a+b)(a^(2)-ab+b^2)`
`b)`
`B=(2020^(3)-1)/(2020^(2)+2021)`
`=[(2020-1)(2020^(2)+2020.1+1^2)]/(2020^(2)+2021)`
`=[2019.(2020^(2)+2021)]/(2020^(2)+2021)`
`=2019`
Áp dụng hằng đẳng thức : `a^(3)-b^(3)=(a-b)(a^(2)+ab+b^2)`
`#Study well`
a, $A=\dfrac{2020^3+1}{2020^2-2019}$$A=\dfrac{(2020+1)(2020^2-2020+1)}{2020^2-2019}$
$A=\dfrac{2021(2020^2-2019)}{2020^2-2019}$$A=2021$
b, $B=\dfrac{2020^3-1}{2020^2+2021}$
$B=\dfrac{2019(2020^2+2021)}{2020^2+2021}$$B=\dfrac{(2020-1)(2020^2+2020+1)}{2020^2+2021}$$B=2019$
giup minh lam bai nay kho qua cam on 950 m 3 = l 1/4 m 3= dm 3
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Ai chỉ cho em tất cả các cách cộng trừ số âm đi ạ em quên rồi mà sắp thi rồi 😭😭
III. Put the verbs in parentheses into the correct form. 28) That was a very strange question (ask) ........................... . 29) It was very kind of you (show)................................. the way. 30) The teacher let him (stay) ..................... at home to finish the assignment. 31) It was quite a surprise (see) .............................. him again. 32) I overheard him (say) ..................... that he didn’t want to learn Math. 33) She stood there and watched him (drive) ............................. away. 34) It was very difficult for her (drive)............................ the motorbike. 35) I could feel the robber (come) ............................. from the backdoor.
Giúp mik nhanh vs,mik cảm ơn tr
Giải thích vì sao hai ADN con được tạo ra qua quá trình nhân đôi lại giống với ADN mẹ
Bài 3: Tính nhanh: a) 14625 + 10657 + 25375 + 19343 d. 542 + 348 + 125 b) 13649 + 21532 + 36551 + 8468 e.129 + 658 + 871 + 342 c) 25638 + 42735 + 7265 + 14762. g) 46513 – (6513 – 297) h) 38765 + 42576 – 8765 – 576 k. 1345 + 678 + 655 i) 15237 – (1 0000 – 1763) Bài 4: Tìm x X + 6754= 12 087 876 + X = 1099 X- 457= 9876 7621- X = 542 3874 + X= 543 + 1975 8954 – X = 3690- 298 X – 456= 234 + 4598 8712 – X = 1234 – 432 647 + X = 6532 x4
1.my house is bigger than your house - your house is 2.the black car is cheaper than the red car. - the red car 3.this film is more interesting than that one. - that film is 4.my kitchen is smaller than your. - your kitchen 5.my grandmother is older than every one in my family. - my grandmother is the 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.i did not spend as much money as you. - you spent 10.i don't think this book is ex+pensive as it is. - this book is
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