Bài này lớp 6 học rùi!
S = 312/25
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tính tổng
S=\(\dfrac{1}{1.3}-\dfrac{1}{2.4}+\dfrac{1}{3.5}-\dfrac{1}{4.6}+\dfrac{1}{5.7}-\dfrac{1}{6.8}+\dfrac{1}{7.9}-\dfrac{1}{8.10}\)
giúp nha
Tính A=2/1.3-4/3.5+6/5.7-8/7.9+...-20/19.21
\(\frac{4}{1.3}+\frac{4}{3.5}+\frac{4}{5.7}+...+\frac{4}{\left(2n-1\right).\left(2n+1\right)}\)
4 phần 1.3 + 4 phần 3.5 + 4 phần 5.7 + ....... + 4 phần 97.99
gips mình
TÍNH:[/:phần]
a)1/2 - 1/3 + 1/4 -1/5 + 1/6 - 1/7 +1/5 - 1/4 + 1/3 - 1/2
b)1/2 + 1/6 + 1/12 +1/20+ 1/30
c)\(\frac{2}{1.3}\)+\(\frac{2}{3.5}\)+\(\frac{2}{5.7}\)+...+\(\frac{2}{47.49}\)
d)\(\frac{4}{1.5}\)+\(\frac{4}{5.9}\)+...+\(\frac{4}{41.45}\)
A =\(\frac{16^3.3^{10}+120.6^9}{4^6.3^{12}+6^{11}}\) B=\(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{\left(2n-1\right).\left(2n+1\right)}\)
1/ A = 12- 22 + 32 - 42+...+ 992- 1002
2/ A = 1.3 + 3.5 + 5.7 +...+ 97.99 + 99.100
3/ A = 2.4 + 4.6 + 6.8 +...+ 99.100 + 100.102
Tính hợp lí:
A = 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128
C = 22/3 . 32/2.4 . 42/3.5 ... 592/58.60
D = 6/1.3 + 6/3.5 + 6/5.7 + ... + 6/2009.2011
E = \(\frac{1.2.3+2.4.6-3.6.9+5.10.15}{1.3.7+2.6.14-3.9.21+5.15.35}\)
F = (1+1/2).(1+1/3).1+1/4)...(1+1/100)
G = 5 - 52/1.6 - 52/6.11 - ... - 52/101.106.
tìm x,biết:
a) |3x-4|+|3y+5|=0
b) |x-y|+|x+9/25|=0
c) |x+1|+|x+2|+|x+3|=4x
d)|x+2|+|x+3/5|+|x+1/2|=42
e)|x+1/1.3|+|x+1/3.5|+|x+1/5.7|