\(\frac{2^3.3^3.5^3.7.8}{3.2^4.5^3.14}=\frac{2^6.3^3.5^3.7}{2^5.7.5^3.3}=\frac{2^5.3.5^3.7.\left(2.3^2\right)}{2^5.3.5^3.7}=18\)
=\(\frac{2^3.3^3.8}{3.2^4.2}\)
=\(\frac{2^3.3^3.4}{3.2^4}\)
=\(\frac{3^2.4}{2}\)
=\(3^2.2\)
=9.2
=18
\(\frac{2^3.3^3.5^3.7.8}{3.2^4.5^3.14}=\frac{2^6.3^3.5^3.7}{2^5.7.5^3.3}=\frac{2^5.3.5^3.7.\left(2.3^2\right)}{2^5.3.5^3.7}=18\)
=\(\frac{2^3.3^3.8}{3.2^4.2}\)
=\(\frac{2^3.3^3.4}{3.2^4}\)
=\(\frac{3^2.4}{2}\)
=\(3^2.2\)
=9.2
=18
A=\(\frac{2}{3.5}+\frac{2}{5.7}+.....+\frac{2}{11.113}\)
Giúp mình nhé !
Tính ( bằng cách hợp lý nếu có thể ):
a) 1/2.3 +1/3.4 + 1/4.5 + .... + 1/9.10
b) 1/2 + 1/6 + 1/12 + .... +1/90
c) 12/1.2 . 22/2.3 . 32/3.4 . 42/4.5
1, (x-3)(x-5)<0
2, 2/1.3+2/3.5+2/5.7+...+2/99.101
3, 5/1.3+5/3.5+5/5.7+...+5/99.101
4, Chứng tỏ rằng phân số 2n+1/3n+2 là phân số tối giản
5, cho A=n+2/n-5(n thuộc Z;n khác 5) Tìm xđể A thuộc Z
a.2/1.3+2/3.5+2/5.7+...+2/99.101
b.5/1.3+5/3.5+5/5.7+...+5/99.101
giúp mk vs
Tính nhanh:
A = 2/3.4 + 2/4.5 + 2/5.6 +......+ 2/98.99.
B = -1/2.3.4 + -1/3.4.5 + -1/4.5.6 +.........+ -1/28.29.30.
\(G=\dfrac{2}{5.8}+\dfrac{2}{8.11}+...+\dfrac{2}{95.98}+\dfrac{2}{98.101}\)
\(X=\dfrac{2^2}{1.3}.\dfrac{3^2}{2.4}.\dfrac{4^2}{3.5}...\dfrac{99^2}{98.100}\)
\(K=\dfrac{1}{3}.\dfrac{1}{15}.\dfrac{1}{35}...\dfrac{1}{9999}\)
5^2.3.2^2+2^2.15:3.5-4^2.3+(215^0)^2020
3.(x-15)-45=10
4^x+2-4^x=60
giúp vs
cho I = \(\dfrac{1.3+2}{4}.\dfrac{3.5+2}{16}.\dfrac{15.17+2}{256}.\dfrac{255.257+2}{65536}.....\dfrac{\left(2^{2^n}-1\right)\left(2^{2^n}+1\right)+2}{2^{2^n}}\)với n ϵ N. Chứng minh: I < \(\dfrac{4}{3}\)