bài 1 : tìm x biết

a, \(\frac{2}{3}\times\left(x-\frac{5}{6}\right)+\frac{1}{4}=\frac{22}{9}\)

b, \(\frac{2}{3}:\frac{x}{5}=\frac{10}{21}\)

c, \(\frac{7}{3}:\frac{x}{5}=\frac{14}{15}\)

d, \(1-\left(5\frac{4}{9}\times x-7\frac{7}{18}\right):15\frac{3}{4}=0\)

bài 2 : tính gtri bt

a,\(\frac{8}{7}+\frac{1}{5}\times\frac{10}{9}\)

b, \(\frac{3}{2}+\left(\frac{9}{2}+\frac{2}{9}\right)\times\left(\frac{4}{3}-\frac{5}{4}\right)\)

!_ove

1.Viết dưới dạng thu gọn 
a, \(8^5.64^2.16^3\)
b, \(81^7.243^3.3^{11}.9^7\)
c. \(6^{15}.8^{17}.9^{31}.81^31024^5\)
2. tìm x biết
a, \(\frac{4}{15}:x+\frac{-1}{3}=\frac{5}{9}\)
b,\(\left(3,25-\frac{2}{3}x\right):\frac{-7}{4}=-3\)
c, \(71+\left(26-3x\right):5=75\)
d, \(3+2^{x-1}=24-[4^2-\left(2^2-1\right)]\)
e, \(\frac{5}{7}-\left|3x+1\right|=\frac{-2}{7}\)
3.tính
a, \(\left(\frac{2}{3}\right)^2:\left(-8\right)-\left(\frac{-1}{4}+\frac{9}{20}\right):1\frac{4}{5}\)
b,\(0,8.\frac{-15}{14}-\frac{4}{5}-\frac{13}{14}-1\frac{2}{5}\)
CÁC BẠN GIÚP MÌNH VỚI MÌNH ĐANG CẦN GẤP
THANKS

\(\left(20+9\frac{1}{4}\right):2\frac{1}{4}\) \(\left(6-2\frac{4}{5}\right).3\frac{1}{8}-1\frac{3}{5}:\frac{1}{4}\)

\(\frac{32}{15}:\left(-1\frac{1}{5}+1\frac{1}{3}\right)\) \(0,2.\frac{15}{36}-\left(\frac{2}{5}=\frac{2}{3}\right):1\frac{1}{5}\)

\(\frac{-3}{7}.\frac{5}{9}+\frac{4}{9}.\frac{-3}{7}+2\frac{3}{7}\) \(0,7.2\frac{2}{3}.20.0,375.\frac{5}{8}\)

1) \(\frac{2}{5}x\frac{1}{3}-\frac{2}{15}:\frac{1}{5}+\frac{3}{5}x\frac{1}{3}\)

2)\(\left(3\frac{1}{3}+2,5\right):\left(3\frac{1}{6}-4\frac{1}{5}\right)-\frac{11}{31}\)

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

4)\(\frac{18}{37}+\frac{8}{24}+\frac{19}{37}-1\frac{23}{24}+\frac{2}{3}\)

5)\(\left(-2\right)^3x\left(\frac{3}{4}-0,25\right):\left(2\frac{1}{4}-1\frac{1}{6}\right)\)

6)\(\left(\frac{2}{5}\right)^2+5\frac{1}{2}x\left(45-2\right)+\frac{23}{4}\)

7)\(\frac{4}{9}-19\frac{1}{3}-\frac{4}{9}x39\frac{1}{3}\)

8)\(\left(-\frac{1}{2}\right)^2:\frac{1}{4}-2x\left(-\frac{1}{2}\right)^2\)

9)\(125\%x\left(-\frac{1}{2}\right)^3:\left(1\frac{5}{16}-1,5\right)+2008^0\)

giúp mình nha mai mình học rùi

a) \(\left|2x\frac{1}{3}\right|+\frac{5}{6}=1\)

b)\(\frac{17}{2}-\left|2x-\frac{3}{4}\right|=-\frac{7}{4}\)

c) \(\frac{2}{3}x-\frac{3}{2}x=\frac{5}{12}\)

d) \(\frac{2}{5}+\frac{3}{5}.\left(3x-3,7\right)=-\frac{53}{10}\)

e) \(\frac{7}{9}:\left(2+\frac{3}{4}x\right)+\frac{5}{9}=\frac{23}{27}\)

f) \(\left(2\frac{4}{5}x-50\right):\frac{2}{3}=51\)

g)\(\left(x+\frac{1}{2}\right).\left(\frac{2}{3}-2x\right)=0\)

h)\(x.3\frac{1}{4}+\left(-\frac{7}{6}\right).x-1\frac{2}{3}=\frac{5}{12}\)

i)\(\frac{6}{2}=\frac{-5+x}{15}\)

k)\(\frac{1}{21}+\frac{1}{28}+\frac{1}{36}+...+\frac{2}{x\left(x+1\right)}=\frac{2}{9}\)

bài 2 tìm x

a,\(\frac{-2}{3}.x+\frac{1}{5}=\frac{3}{10}\)

b,\(\left|x\right|-\frac{3}{4}=\frac{5}{3}\)

c,\(\frac{2}{3}.x-\frac{1}{2}=\frac{1}{10}\)

d,\(\frac{3}{5}+\frac{4}{9}:x=\frac{2}{3}\)

e,\(\left|x+75\%\right|=2\frac{1}{5}\)

i,\(\left(x+\frac{1}{2}\right).\left(\frac{2}{3}-2.x\right)=0\)

k,\(\frac{4}{7}.x-\frac{2}{3}=\frac{1}{5}\)

l,\(\frac{2}{3}.x-\frac{3}{2}.x=\frac{5}{12}\)

m,\(\left|2.x-\frac{1}{3}\right|+\frac{5}{6}=1\)

n,\(\frac{1}{3}-\frac{7}{8}.x=\frac{1}{3}\)

11,\(\frac{x+2}{5}=\frac{7}{12}-1\frac{1}{4}\)

12,\(\left(2\frac{4}{5}.x-50\right):\frac{2}{3}=51\)

13,\(\frac{2}{5}+\frac{3}{5}.\left(3.x-3,7\right)=-\frac{53}{10}\)

14,\(\frac{7}{9}:\left(2+\frac{3}{4}.x\right)+\frac{5}{9}=\frac{23}{27}\)

Bài 1: Thực hiện phép tính(tính nhanh nếu có thể)

a) \(\frac{-4}{5}:\frac{8}{7}\)

b) \(\frac{-3}{8}.\frac{7}{9}+\frac{-3}{8}.\frac{2}{9}+0,25\)

c) 15\(\frac{3}{7}-\left(2\frac{4}{9}+11\frac{3}{7}\right)\)

Bài 2: Tìm x, biết:

a) x+\(\frac{2}{3}=\frac{5}{6}\)

b) 2\(\frac{3}{5}-8x=\left(\frac{1}{7}-\frac{1}{8}\right).56\)