\(D=\left(1-\frac{1}{7}\right).\left(1-\frac{2}{7}\right).\left(1-\frac{3}{7}\right)...\left(1-\frac{10}{7}\right)\)
\(D=\frac{6}{7}.\frac{5}{7}.\frac{4}{7}...\frac{-3}{7}\)
\(D=\frac{6.5.4.3.2.1.0.\left(-1\right).\left(-2\right).\left(-3\right)}{7}\)
\(D=\frac{0}{7}\)
\(D=0\)
Tính:
D = 1 - 2 - 3 + 4 + 5 - 6 - 7 +...+ 996 + 997 + 2023
Bài 1: Thực hiện các phép tính:
d) 3,15+2,4=5,55
e) \(\dfrac{5}{7}.\dfrac{2}{11}+\dfrac{5}{7}.\dfrac{9}{11}\)
f) 1,25.3,6+3,6.8,75
h) B= \(\dfrac{1}{1.2}+\dfrac{1}{2.3}+\dfrac{1}{3.4}+\dfrac{1}{4.5}+\dfrac{1}{5.6}+...+\dfrac{1}{99.100}\)
Tính:D=99-97+95-93+91-89+.......+7-5+3-1
D=?
tính:(1-1/7)×(1-2/7)×(1-3/7)×...×(1-10/7)
Tinh: (1-1/7)(1-2/7)(1-3/7)...(1-10/7)
(5/7-7/7)-[0,2-(-2/7-1/10]
(3-1/4+2/3)-(5-1/3-5/6)-(6-7/4+-3/2)
1/3-3/4--3/5+1/64-2/9-1/3+1/15
3/5:(1/15-1/6)+3/5:(-1/3-16/15)
1/2(-3/4-13/14):5/7-(-2/21+1/7):7/7
Tính nhanh
D= (1-1/7).(1-2/7).(1-3/7)...(1-10/7
Tính phân số
A, 2/3 + 1/5 . 10/7
B, 2/7 + 5/7 . 14/25
C, 7/12 - 27/7 . 1/18
D, 3/10 . (-5/6) - 1/8
| a) 3/13 + 7/12 - 10/13 + 5/12 | d) -5/10 + 12/28 - 3/27 - 7/18 + 20/35 |
| b) 15/24 - 6/26 + 28/48 - 30/39 + 10/24 | e) 1/56 + 1/72 + 1/90 + 1/110 + 1/132+ 1/156 = |
| c) -1/2 + 3/7 - 1/9 - 7/18 + 4/7 = |
