Tính : (1\68 + 1\968 - 1\1968)*(1\23 - 1\6- 1\6)
Tính :
(1/68+1/968-1/1968)(1/23-1/6-1/6)
Tính :
(1/68+1/968+1/1968)(1/23-1/6-1/6)
tính : (\(\dfrac{1}{68}\) + \(\dfrac{1}{968}\) - \(\dfrac{1}{1968}\) )( \(\dfrac{1}{23}\) - \(\dfrac{1}{6}\) - \(\dfrac{1}{6}\))
\(\left(\dfrac{1}{68}+\dfrac{1}{968}-\dfrac{1}{1968}\right)\left(\dfrac{1}{23}-\dfrac{1}{6}-\dfrac{1}{6}\right)\)
\(=\dfrac{61657}{4048176}\cdot\left(-\dfrac{20}{69}\right)\)
\(=-\dfrac{61657}{1012044}\cdot\dfrac{5}{69}\)
\(=-\dfrac{308285}{69831036}\)
tính :
(1/68+1/968-1/1969)(1/23-1/6-1/6)
\(\left(\dfrac{1}{68}+\dfrac{1}{968}-\dfrac{1}{1969}\right)\left(\dfrac{1}{23}-\dfrac{1}{6}-\dfrac{1}{6}\right)\)
\(=\dfrac{44865}{2945624}\cdot\left(-\dfrac{20}{69}\right)\)
\(=-\dfrac{14955}{736406}\cdot\dfrac{5}{23}\)
\(=-\dfrac{74775}{16937338}\)
tÍNH BẰNG CÁCH HỢP LÝ:
a.4525-(864-999)-(36+3999)
b.(-35).68+32.(-35)
c.(-23).43+77.(-43)
d.(-25).68+(-34).(-250)
e.1-2+3-4++5-6+...+2017-2018+2019
f.1+3-5-7+9+11-...-397-399
Bài 6. Tính giá trị biểu thức bằng cách hợp lí nhất nếu có thể:
1, 2155– (174 + 2155) + (-68 + 174) 2, -25 . 72 + 25 . 21 – 49 . 25 3, 35(14 –23) – 23(14–35) 4, 8154– (674 + 8154) + (–98 + 674) 5, – 25 . 21 + 25 . 72 + 49 . 25 6, 27(13 – 16) – 16(13 – 27) | 7, –1911 – (1234 – 1911) 8, 156.72 + 28.156 9, 32.( -39) + 16.( –22) 10, –1945 – ( 567– 1945) 11, 184.33 + 67.184 12, 44.( –36) + 22.( –28) |
8: =156x200=31200
10: =-1945-567+1945=-567
A=\(\frac{\frac{1}{9}-\frac{1}{6}-\frac{1}{51}}{\frac{1}{8}-\frac{1}{52}+\frac{1}{68}}:5\frac{1}{6}\)tính A
Tính :\(\frac{\frac{1}{39}-\frac{1}{6}-\frac{1}{51}}{\frac{1}{8}-\frac{1}{52}-\frac{1}{68}}:\frac{31}{6}\)
SỐ LẺ NHA BẠN - \(\frac{1704}{4991}\)
Cách giải bạn có thể hướng dẫn mk ko cảm ơn bạn nhiều!
Dùng tính chất để tính
a) 17/5 . -31/125 . 1/2 . 10/17 . -1/23
b) (11/4 . -5/9 - 4/9 . 11/4) . 8/33
c) (17/28 + 18/29 - 19/30 - 20/31) . (-5/12 + 1/4 + 1/6)
d) -1/4 . 15^2/11 + 68/4 . -1/11
e) -9/25 . 53/3 - (-3/5)^2 .22/3