Mong MN giải giùm nha!
*3^14:(3^9.27)+5^2.2^5-4^3
*2^3.5-3^2.4+4.6
\(\dfrac{2^2}{1.3}.\dfrac{3^2}{2.4}.\dfrac{4^2}{3.5}.\dfrac{5^2}{4.6}\)
Help me, các chế ơi
\(\dfrac{4}{3}\times\dfrac{9}{8}\times\dfrac{16}{15}\times\dfrac{25}{24}=\dfrac{5}{3}\)
`(2^2)/(1 . 3) . (3^2)/(2 . 4) . (4^2)/(3 . 5) . (5^2)/(4 . 6)`
`= 4/3 . 9/8 . 16/15 . 25/24 = 5/3`
Tính:
1/25:5,7
2/30:2.8.4
3/20:2^2.14
4/125:5^3.170
5/64:2^5.30.4
6/(25:5^2.30):15.7
7/(64:2^4.16):32.48
8/(81:3^3.15):9.(40:8.2)
9/[ (5^2.2:10).4]:(2^2.5:2)
10/(15:3.5^2):(20:2^2)
11/2^2.3^2-5.2.3
12/3^2.5-2^2.7+1.5
13/5^2.2-3^2.4
14/7^2.3-5^2.3
15/2^33.3^2-4^2.3
16/5^2.2^3+3^2.7-8^2.2
17/(5.2^2-20):5+3^2.6
18/(24.5-5^2.2):(5.2)-3
19/[(5^2.2^3-7^2.2):2].6-7.2^5
20/(6.5^2-13.7).2-2^3(7+3)
các bạn ơi ,giúp mình đi nha ,chỉ trong 3 tiếng nữa thôi mình phải nộp bài rồi .bạn nào làm được mình hứa sẽ tích đúng cho luôn nha
1. 25 : 5,7 = 250/57
2. 30:2.8.4 = 480
3. 20:2^2.14= 70
4. 125:5^3.170= 170
5. 64:2^5.30.4=240
6. (25:5^2.30): 15.7=14
bạn à! Nhiều quá mình ko làm hết được. sorry nha.^-^
dù dài quá nhưng cố gắng giúp mình làm hết nha
TÍNH:\(\frac{2^2}{1.3}.\frac{3^2}{2.4}.\frac{4^2}{3.5}.\frac{5^2}{4.6}\).
\(A=\frac{2^2}{1.3}\cdot\frac{2^2}{2.4}\cdot\frac{2^2}{3.5}\cdot\frac{2^2}{4.6}\)
\(A=\frac{4}{3}\cdot\frac{1}{2}\cdot\frac{4}{15}\cdot\frac{1}{6}\)
\(A=\frac{4.1.4.1}{3.2.15.6}\)
\(A=\frac{4}{135}\)
\(\frac{2^2}{1.3}.\frac{3^2}{2.4}.\frac{4^2}{3.5}.\frac{5^2}{4.6}\)
\(=\frac{2.2}{1.3}.\frac{3.3}{2.4}.\frac{4.4}{3.5}.\frac{5.5}{4.6}\)
\(=\frac{2.3.4.5}{1.2.3.4}.\frac{2.3.4.5}{3.4.5.6}\)
\(=\frac{5}{1}.\frac{2}{6}\)
\(=\frac{5}{1}.\frac{1}{3}\)
\(=\frac{5}{3}\)
Tính
A=13/21.2/11+13/21.9/11+8/21.
B=(1-1/5).(1-2/5).(1-3/5)...(1-9/5)
C= (1-1/2).(1-1/3).(1-1/4)...(1-1/50)
D= 2²/1.3 . 3²/2.4 . 4²/3.5 . 5²/4.6 . 6²/5.7
A = 13/21.2/11 + 13/21.9/11 + 8/21
= (13/21) + (13/21) + (8/21)
= (13 + 13 + 8)/21
= 34/21
B = (1 - 1/5)(1 - 2/5)(1 - 3/5)...(1 - 9/5)
= (4/5)(3/5)(2/5)(1/5)(0/5)(-1/5)(-2/5)(-3/5)(-4/5)
= 0
C = (1 - 1/2)(1 - 1/3)(1 - 1/4)...(1 - 1/50)
= (1/2)(2/3)(3/4)(4/5)...(49/50)
= 1/50
D = (2^2/1.3) * (3^2/2.4) * (4^2/3.5) * (5^2/4.6) * (6^2/5.7)
= (4/3) * (9/8) * (16/15) * (25/23) * (36/35)
= 0.979
A=(1-1/2).(1-1/3). ... .(1-1/2011)
B=3/2.4/3.5/4.6/5. ... .1000/999
Tính hợp lý:
C = 2²/1.3 . 3²/2.4 . 4²/3.5 . 5²/4.6 . ... . 10²/9.11
\(C=\frac{2^2}{1.3}.\frac{3^2}{2.4}.\frac{4^2}{3.5}.\frac{5^2}{4.6}...\frac{10^2}{9.11}\)
\(=\frac{2^2.3^2.4^2...10^2}{1.3.3.5.5.7.7.9.9.11.2.4.4.6.6.8.8.10}\)
\(=\frac{2^2.3^2.4^2...10^2}{2.3^2.4^2.5^2.6^2.7^2.8^2.9^2.10.11}=\frac{10}{2.11}=\frac{10}{22}=\frac{5}{11}\)
1. 160:{|-17|+[3^2.5-(14+2^11:2^8]}
2. 16.(38-2)-38.(16-1)
3. |-6|+(-7)+|-4|+(-3)
4. 26.(-125)-125.(-36)
5. 5^6:5^3-5^0.5^1.5^2
6. 125.(-24)+24.225
7. 21.135+21.65-200
8. 42+(-19)+58-(-19)
9. 100:{31-[24:(18-7.2)]}
10. 2^3.5-3^2.4+4.6
đăng ít thôi bạn đăng nhiều thế mới nhìn vào đã thấy chóng mặt huống chi là giải
2: \(=16\cdot38-16\cdot2-38\cdot16+38=-32+38=6\)
3: \(=6-7+4-3=10-10=0\)
4: \(=-125\left(26-36\right)=-125\cdot\left(-10\right)=1250\)
5: \(=5^3-5^3=0\)
6: \(=24\left(-125+225\right)=100\cdot24=2400\)
7: =21(135+65)-200
=200*21-200
=200*20=4000
8: =42+58-19+19=100
Tính:A=\(\dfrac{1.3}{2^2}.\dfrac{2.4}{3^2}\dfrac{3.5}{4^2}.\dfrac{4.6}{5^2}...\dfrac{2016.2018}{2017^2}\)
Tính \(C=\frac{2^2}{1.3}.\frac{3^2}{2.4}.\frac{5^2}{3.5}.\frac{4^2}{4.6}\)
C=2.2.3.3.4.4.5.5/1.3.2.4.3.5.4.6
C=(2.3.4.5).(2.3.4.5)/(1.2.3.4).(3.4.5.6)
C=2.5/6
C=5/3
C=2^2/1.3.3^2/2.4.5^2/3.5.4^2/4.6
C= 2.2.3.3.5.5.4.4/1.3.2.4.3.5.4.6
C=(2.3.4.5).(2.3.4.5)/(1.2.3.4).(3.4.5.6)
C=5.2/6
C=5/3
\(\frac{2^2}{1.3}.\frac{3^2}{2.4}.\frac{5^2}{3.5}.\frac{4^2}{4.6}\)
\(=\frac{2^2.3^2.5^2.4^2}{1.3.2.4.3.5.4.6}\)
\(=\frac{2^2.3^2.4^2.5^2}{1.2.3^2.4^2.5.6}\)
\(=\frac{2.5}{6}\)
\(=\frac{10}{6}=\frac{5}{2}\)