9999+88=.....
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Tính bằng cách nhanh nhất:
a)3333*3333:9999
b)2222*9999:3333
c)99 999*88 888:11 111
d)6666*8+4444*13
3333*3333:9999
=3333*3333:3333:3
=3333:3=1111
b,2222*9999:3333
=2222*3333*3:3333
=2222*3=6666
c,99999*88888:11111
=99999*11111*8:11111
=99999*8=799992
d, 6666*8+4444*14
=1111*8*6+1111*4*14
=1111*48+1111*56
=1111*(48+56)
=1111*104=115544
ba câu đầu bạn làm đúng rồi shitbo.nhưng câu cuối bạn làm sai.cố lên nha bạn.mình đâu
\(A=\frac{1}{10}+\frac{1}{40}+\frac{1}{88}+\frac{1}{154}+\frac{1}{238}+\frac{1}{340}\)
\(A=\frac{1}{2.5}+\frac{1}{5.8}+\frac{1}{8.11}+\frac{1}{11.14}+\frac{1}{14.17}+\frac{1}{17.20}\)
\(3A=3.\left(\frac{1}{2.5}+\frac{1}{5.8}+\frac{1}{8.11}+\frac{1}{11.14}+\frac{1}{14.17}+\frac{1}{17.20}\right)\)
\(3A=\frac{3}{2.5}+\frac{3}{5.8}+\frac{3}{8.11}+\frac{3}{11.14}+\frac{3}{14.17}+\frac{3}{17.20}\)
\(3A=\frac{5-2}{2.5}+\frac{8-5}{5.8}+\frac{11-8}{8.11}+\frac{14-11}{11.14}+\frac{17-14}{14.17}+\frac{20-17}{17.20}\)
\(3A=\frac{1}{2}-\frac{1}{5}+\frac{1}{5}-\frac{1}{8}+\frac{1}{8}-\frac{1}{11}+\frac{1}{11}-\frac{1}{14}+\frac{1}{14}-\frac{1}{17}+\frac{1}{17}-\frac{1}{20}\)
\(3A=\frac{1}{2}-\frac{1}{20}\)
\(A=\left(\frac{1}{2}-\frac{1}{20}\right)\div3=\frac{9}{20}\div3=\frac{9}{20.3}=\frac{3}{20}\)
Vậy ................
\(B=\frac{3}{4}\cdot\frac{8}{9}\cdot\frac{15}{16}\cdot....\cdot\frac{9999}{10000}\)
\(B=\frac{1.3}{2.2}\cdot\frac{2.4}{3.3}\cdot\frac{3.5}{4.4}\cdot...\cdot\frac{99.101}{100.100}\)
\(B=\frac{\left(1\cdot2\cdot3\cdot...\cdot99\right).\left(3\cdot4\cdot5\cdot...\cdot101\right)}{\left(2\cdot3\cdot4\cdot...\cdot100\right).\left(2\cdot3\cdot4\cdot...\cdot100\right)}\)
\(B=\frac{1\cdot2\cdot3\cdot..\cdot99}{2\cdot3\cdot4\cdot..\cdot100}\cdot\frac{3\cdot4\cdot5\cdot...\cdot101}{2\cdot3\cdot4\cdot...\cdot100}\)
\(B=\frac{1}{100}\cdot\frac{101}{2}=\frac{101}{200}\)
vậy......
A=1/2.5+1/5.8+1/8.11+1/11.14+1/14.17+1/17.20
A=1/3.(3/2.5+3/5.8+3/8.11+3/11.14+3/14.17+3/17.20)
A=1/3.(1/2-1/20)
=3/20
B=1.3/2.2+2.4/3.3+3.5/4.4+...+99.101/100.100
B=(1.2.3...99).(3.4.5...101)/(2.3.4...100).(2.3.4...100)
B=\(\frac{1.2....99}{2.3...100}\).\(\frac{3.4...101}{2.3...100}\)
B=1/100.101/2=101/200
a) 4; 5;6
b) 86; 87; 88
c) 896; 897;898.
d) 9; 10;11
e) 99; 100;101.
g) 9998; 9999;10000
a) 4; 5;6
b) 86; 87; 88
c) 896; 897;898.
d) 9; 10;11
e) 99; 100;101.
g) 9998; 9999;10000
9999 x 9999 - 9999 + 9999 * 9999=199950003
8888 x 8888 - 8888 + 8888 * 8888 =78987656
7777 x 7777 - 7777 + 7777 * 7777 =120955681
9999 x 9999 - 9999 + 9999 * 9999=199950003
8888 x 8888 - 8888 + 8888 * 8888 =157984200
7777 x 7777 - 7777 + 7777 * 7777 =120955681
9999 + 88 = 9999 + 1 + (88-1)
= 10 000 + 87
= 10 087
9999+88=10 087