Violympic toán 7
Các câu hỏi tương tự
Tính nhanh
(2+4+6+100)*(3/5:0.7+3*-2/7):(1/2+1/4+1/6+...+1/100) tinhs nhanh
A = 1*2*3+3*4*5+5*6*7+...+99*99*100
ai giải giùm với ạ
P = 91+2+3+...+100)(1/2-1/3-1/7-1/9)(63 x 1.2 - 21 x 3.6) tất cả trên 1-2+3-4+5-6+...+99-100
CMR : 1/3 - 2/3^2 + 3^3 - 4/3^4 + .... + 99/3^99 - 100/3^100 < 3/16
1-2+3-4+5-6+...+99-100
Tính [100/3] + [100/3^2] + [100/3^3] + [100/3^4]
Tính [100/3] + [100/3^2] + [100/3^3] + [100/3^4]
\(\dfrac{\left(13\dfrac{1}{4}-2\dfrac{5}{27}-10\dfrac{5}{6}\right).230\dfrac{1}{25}+46\dfrac{3}{4}}{\left(1\dfrac{3}{10}+\dfrac{10}{3}\right):\left(12\dfrac{1}{3}-14\dfrac{2}{7}\right)}\)
\(\dfrac{\left(1+2+3+...+99+100\right)\left(\dfrac{1}{2}-\dfrac{1}{3}-\dfrac{1}{7}-\dfrac{1}{9}\right)\left(63.1,2-21.3,6\right)}{1-2+3-4+.....+99-100}\)
Chứng minh: \(\frac{1}{3}+\frac{2}{3^2}+\frac{3}{3^3}+\frac{4}{3^4}+...................+\frac{100}{3^{100}}< \frac{3}{4}\)