Câu 1 : Tính

a) \(\frac{2}{3}\)+\(\frac{1}{3}\)x ( \(\frac{-4}{9}\)+\(\frac{5}{6}\)) : \(\frac{7}{12}\)

b) S = \(\frac{1}{2}\)x \(\frac{1}{3}\)+\(\frac{1}{3}\)x\(\frac{1}{4}\)+\(\frac{1}{4}\)x\(\frac{1}{5}\)+\(\frac{1}{5}\)x\(\frac{1}{6}\)+\(\frac{1}{6}\)x\(\frac{1}{7}\)+\(\frac{1}{7}\)x\(\frac{1}{8}\)+\(\frac{1}{8}\)x\(\frac{1}{9}\)

c) A = \(\frac{5}{5.7}\)+\(\frac{5}{7.9}\)+...+\(\frac{5}{59.61}\)

d) M = \(\frac{3}{4}\)x\(\frac{8}{9}\)x\(\frac{15}{16}\)x\(\frac{24}{25}\)x...x\(\frac{99}{100}\)

e) N = \(\frac{1}{2}\)x\(\frac{-2}{3}\)x\(\frac{3}{4}\)x\(\frac{-4}{5}\)x\(\frac{5}{6}\)x\(\frac{-6}{7}\)x...x\(\frac{-98}{99}\)x\(\frac{99}{100}\)

[ Các bạn trả lời cách tính nhanh mà đúng nhá :)) ]

[ Cảm ơn các bạn nhiều <3 ]

bài 1:

a, (1-\(\frac{3}{6}\)²)+/\(\frac{-7}{23}\)/+(-\(\frac{4}{25}\))

b, \(\sqrt{25}\)-\(\sqrt{100}\)+\(\sqrt{36}\)

c,(\(\frac{-31}{37}\))⁵.(\(\frac{37}{62}\))⁵

bài 2:

a,(x-\(\frac{3}{5}\))²=4

b,2^x+2^x+3=144

xg trc tick cho

Câu1: a) Tìm tất cả các số nguyên(x,y) thỏa mãn: \(\frac{x}{2}\)-\(\frac{2}{y}\)=\(\frac{1}{2}\)

b) Tính hợp lý: A =(\(\frac{1}{2}\)+\(\frac{1}{12}\)+\(\frac{1}{30}\)+...............+\(\frac{1}{9900}\)) : (\(\frac{-6}{51}\)-\(\frac{6}{52}\)-\(\frac{6}{53}\)-............-\(\frac{6}{100}\))

Tính giá trị biểu thức sau:

a)\(\frac{1^2}{1.2}\)x \(\frac{2^2}{2.3}\)x\(\frac{3^2}{3.4}\)x\(\frac{4^2}{4.5}\)x\(\frac{5^2}{5.6}\)

b)\(\frac{2^2}{1.3}\)x\(\frac{3^2}{2.4}\)x\(\frac{4^2}{3.5}\)x\(\frac{5^2}{4.6}\)x\(\frac{6^2}{5.7}\)

c)(\(1+\frac{1}{2}\))(\(1+\frac{1}{3}\))(\(1+\frac{1}{4}\))(1+\(\frac{1}{5}\))

bài 1

a,\(\frac{x}{5}\)=\(\frac{2}{3}\)

b,\(\frac{x}{3}\)-\(\frac{1}{2}\)=\(\frac{1}{5}\)

c,\(\frac{x}{5}\)+\(\frac{1}{2}\)=\(\frac{6}{10}\)

d,\(\frac{x+3}{15}\)=\(\frac{1}{3}\)

e,\(\frac{x-12}{4}\)=\(\frac{1}{2}\)

h,\(\frac{4}{5}\)+x=\(\frac{2}{3}\)

i,\(\frac{3}{4}\)-x=\(\frac{1}{3}\)

k,\(\frac{-5}{6}\)-x=\(\frac{2}{3}\)

l,x-\(\frac{5}{9}\)=\(\frac{-2}{3}\)

m,\(\frac{1}{2}\)x+\(\frac{1}{2}\)=\(\frac{5}{2}\)

n,\(\frac{-2}{3}\)-\(\frac{1}{3}\)(2x-5)=\(\frac{3}{2}\)

p,(3x-1)(\(-\frac{1}{2}\)x+5)=0

q,\(3\frac{1}{3}\)+\(\frac{5}{6}\)x=\(3\frac{1}{2}\)

s,\(\frac{1}{2}\)-\(\frac{2}{3}\)x=\(\frac{7}{12}\)

t,\(\frac{3}{4}\)x+\(\frac{1}{5}\)=\(\frac{1}{6}\)

u,\(\frac{3}{8}\)-\(\frac{1}{6}\)x=\(\frac{1}{4}\)

mn ơi'-' xin hãy giúp mk với ạ>^<,mk cần rất gấp,mai nộp r ạ,mong mn giúp mk với ạ:(( huhuhu r mk tik cho:<<

a) M=1+\(\frac{1}{2}\)+ \(\frac{1}{2^2}\) +..............................+ \(\frac{1}{2^{99}}\)+ \(\frac{1}{2^{100}}\)

b)(\(\frac{1}{3}\)+ \(\frac{1}{6}\) -\(\frac{1}{10}\)+.................................+\(\frac{1}{x\left(x+1\right):2}\)= \(\frac{2001}{2003}\)

       a Tính M

       b Tính X

             Tính giá trị biểu thức:

                    [6+ (\(\frac{1}{2}\))\(^3\)-/-\(\frac{1}{2}\)/]:\(\frac{3}{12}\)

              Tìm x:

                    -5.( x+ \(\frac{1}{5}\)) -\(\frac{1}{2}\).(x-\(\frac{2}{3}\))= \(\frac{3}{2}\)x-\(\frac{5}{6}\)      ;        3.(x -\(\frac{1}{2}\))- 5.( x+ \(\frac{3}{5}\))= -x+ \(\frac{1}{5}\)