Cho 2(x-y) = 5(y+z) = 3(x+z) . Chứng minh rằng : \(\frac{x-y}{4}=\frac{y-z}{5}\)
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Khách
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SC
2
HA
12 tháng 3 2020
\(\left(-\frac{3}{4}\right)^{3x-1}=-\frac{27}{64}\)
\(\left(-\frac{3}{4}\right)^{3x-1}=\left(-\frac{3}{4}\right)^3\)
\(\Rightarrow3x-1=3\)
\(\Rightarrow3x=4\)
\(\Rightarrow x=\frac{4}{3}\)
12 tháng 3 2020
\(\left(-\frac{3}{4}\right)^{3x-1}\)= \(\frac{-27}{64}\)
đây là lỗi nhỏ mong online math mong đừng trừ điểm và mong các bạn thông cẩm
12 tháng 3 2020
1, met -> meet
2, was -> were
3, has -> had ; go -> went
4, cryed -> cried
5, dream -> dreamt
6, do -> did
7, doesn't -> didn't
8, live -> lived
9, invited -> invite
10, makes -> made
12 tháng 3 2020
1. met -> meet.
2. was -> were.
3. has -> had.
4. cryed -> cried.
5. dream -> dreamed.
6. do -> did.
7. doesn't -> didn't.
8. live -> lived.
9. invented -> invent.
10. makes -> made.
TL
12 tháng 3 2020
KEY:
1. met > meet
2. was > were
3. has > have
4. cryed > cried
5. dream > drought
6. do > did
7. doesn't > didn't
8. live > lived
9. inveted (sai chính tả hay sao ấy) > invite
10. makes > made
PH
12 tháng 3 2020
1. I didn't met her last night. => meet
2. My parents was happy when I took my first steps => were
3 Last weekend, they has dinner at a famous restaurant and then go to the cinema together. => had
4. Yesterday,she watched a sad movie and cryed so much => cried
5 My sister dream about a new car last night => dreamt
6 Who do you talk to in front of the gate yesterday morning? => did
7 She doesn't do her homework yesterday => didn't
8 My family live in Hanoi four years ago => lived
9 Did you invited them to your birthday party last Firday? => invite
10 Last month, my mother makes more than 20 dresses. => made
LB
12 tháng 3 2020
a. Quãng đường đi của tiếng vang đó là:
1/5 × 340 = 68 (m)
b. Khoảng cách từ người đó đến vách hang động là:
68 ÷ 2 = 34 (m)
Học tốt ~♡
Vì 5(y+z) = 3(x+z)
Suy ra (x+z) / 5 = (y+z) / 3 = (x+z-y-z) / 5-3 = (x-y) / 2
Suy ra (x+z) / 5 = (x-y) / 2 tương đương (x+z) / 10 = (x-y) / 4 (1)
2(x+y) = 3(x+z)
Suy ra (x+z) / 2 = (x+y) / 3 = (x+z-x-y) / 2-3 = y-z
(x+z) / 2 = y-z
Tương đương (x+z) / 10 = (y-z) / 5 (2)
Từ (1) và (2) suy ra: