6829 : 41= ???
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\(\left(\dfrac{1}{3}+\dfrac{12}{67}+\dfrac{13}{41}\right)-\left(\dfrac{79}{67}-\dfrac{28}{41}\right)\\ =\left(\dfrac{103}{201}+\dfrac{13}{41}\right)-\dfrac{1363}{2747}\\ =\dfrac{6836}{8241}-\dfrac{1363}{2747}\\ =\dfrac{1}{3}\)
\(\left(\dfrac{1}{3}+\dfrac{12}{67}+\dfrac{13}{41}\right)-\left(\dfrac{79}{67}-\dfrac{28}{41}\right)\\ =\dfrac{1}{3}+\dfrac{12}{67}+\dfrac{13}{41}-\dfrac{79}{67}+\dfrac{28}{41}\\ =\dfrac{1}{3}+\left(\dfrac{12}{67}-\dfrac{79}{67}\right)+\left(\dfrac{13}{41}+\dfrac{28}{41}\right)\\ =\dfrac{1}{3}-\dfrac{67}{67}+\dfrac{41}{41}\\ =\dfrac{1}{3}-1+1\\ =\dfrac{1}{3}\)
64827 + 21957 86784 86149 + 12735 98884 37092 + 35864 72956 72468 + 6829 79297
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Bạn thử đặt t = 2x xong đổi biến, đổi biến xong rồi thì nguyên hàm từng phần u = t ; dv = f'(t)dt thử ra không
41 on
42 with/and
Tham khảo vế 1 c42
43 for
44 of
45 to
46 on
47 with
48 of
49 from
50 of
41. Roger: " I don't believe it. " - Anita: " ..................... "
→ Đáp án: C. Neither do I
42. Jill : " Do you know Lisa's an excellent pianist ? - Maria: " ..................... "
→ Đáp án: B. Yes, she does
43. Karen: " ............... this word in English ? " - Betsy: " C-O-Z-Y "
→ Đáp án: B. How do you spell
44. Customer: " I think my change is wrong. " - Shop assistant: " ................... "
→ Đáp án: C. Sorry. I don't think I have any change
45. Mandy: " I've got a toothache. " - George: " ................. "
→ Đáp án: D. Why don't you see the dentist ?
\(720:\left[41-\left(2x-5\right)\right]=2^2.5\\ =>720:\left(41-2x+5\right)=4.5=20\\ =>46-2x=720:20=36\\ =>2x=46-36=10\\ =>x=5\)
\(720:\left[41-\left(2x-5\right)\right]=2^2\cdot5\)
\(\Rightarrow720:\left[41-\left(2x-5\right)\right]=4\cdot5\)
\(\Rightarrow720:\left[41-\left(2x-5\right)\right]=20\)
\(\Rightarrow41-\left(2x-5\right)=720:20\)
\(\Rightarrow41-\left(2x-5\right)=36\)
\(\Rightarrow2x-5=41-36\)
\(\Rightarrow2x-5=5\)
\(\Rightarrow2x=5+5\)
\(\Rightarrow2x=10\)
\(\Rightarrow x=\dfrac{10}{2}\)
\(\Rightarrow x=5\)
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