\(-x=\frac{-1}{3}-\frac{5}{9}\)
\(-x=\frac{-8}{9}\)
Vậy \(x=\frac{8}{9}\)
−x=−1/3 −5/9
−x=−8/9
Vậy x=8/9
5/9 +x/-1=-1/3
5/9 -x=-1/3
-x=-1/3-5/9
-x=-8/9
x=8/9
\(-x=-\frac{1}{3}-\frac{5}{9}\)
\(-x=-\frac{8}{9}\)
Vậy \(x=\frac{8}{9}\)
\(-x=\frac{-1}{3}-\frac{5}{9}\)
\(-x=\frac{-8}{9}\)
Vậy \(x=\frac{8}{9}\)
−x=−1/3 −5/9
−x=−8/9
Vậy x=8/9
5/9 +x/-1=-1/3
5/9 -x=-1/3
-x=-1/3-5/9
-x=-8/9
x=8/9
\(-x=-\frac{1}{3}-\frac{5}{9}\)
\(-x=-\frac{8}{9}\)
Vậy \(x=\frac{8}{9}\)
tìm phần nguyên
\(A=\left(\frac{-5}{11}\right).\frac{7}{15}+\frac{11}{-5}.\frac{30}{33}\)
\(B=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+....+\frac{1}{x.\left(x+1\right)}\)(x∈Z)
\(C=\frac{1}{3}-\frac{3}{5}+\frac{5}{7}-\frac{7}{9}+\frac{9}{11}-\frac{11}{13}+\frac{11}{13}-\frac{9}{11}+\frac{7}{9}-\frac{5}{7}+\frac{3}{5}-\frac{1}{3}\)
\(D=\frac{1}{3}-\left[\left(-\frac{5}{4}\right)-\left(\frac{1}{4}+\frac{3}{8}\right)\right]\)
giúp mk nhé, mk tk, mk thanks nhiều
Bài 1 : tìm x, biết
a) \(\left(\frac{1}{4}-x\right)\left(x+\frac{2}{5}\right)=0\)
bài 2 : Thực hiện các phép tính sau bằng cách hợp lí nếu có thể :
a) \(\left(\frac{13}{24}-\frac{29}{30}\right):\left(\frac{-51}{5}\right)\)
bài 3 : tính nhanh
A = \(\frac{1}{3}-\frac{3}{4}-\left(\frac{-3}{5}\right)+\frac{1}{72}-\frac{2}{9}-\frac{1}{36}+\frac{1}{15}\)
B = \(\frac{1}{5}-\frac{3}{7}+\frac{5}{9}-\frac{2}{11}+\frac{7}{13}-\frac{9}{16}-\frac{7}{13}+\frac{2}{11}-\frac{5}{9}+\frac{3}{7}-\frac{1}{5}\)
C = \(\frac{1}{100}-\frac{1}{100.99}-\frac{1}{99.98}-\frac{1}{98.97}-....-\frac{1}{3.2}-\frac{1}{2.1}\)
Bài 1: A= \(\frac{1}{3}-\frac{3}{5}+\frac{5}{7}-\frac{7}{9}+\frac{9}{11}-\frac{11}{13}+\frac{13}{15}+\frac{11}{13}-\frac{9}{11}+\frac{7}{8}-\frac{5}{7}+\frac{3}{5}-\frac{1}{3}\)
Bài 2:Tìm x , 3x.\(\left(x-\frac{2}{3}\right)=0\)
Tìm x biết
a) (8-5x).(x+2)+4.(x-2).(x+1)+2.(x-2).(x+2)=0
b)\(\left(-\frac{2}{5}+x\right):\frac{7}{9}+\left(-\frac{3}{5}+\frac{5}{6}\right):\frac{7}{9}=0\)
c)\(1+\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{2}{x\left(x+1\right)}=1\frac{2003}{2004}\)
\(\frac{4}{9}:\frac{-1}{7}+6\frac{5}{9}.\frac{2}{3}\)
\(\left(\frac{-1}{3}\right)^4.\frac{4}{11}+\frac{7}{11}.\left(\frac{-1}{3}\right)^2\)
\(\left(\frac{-1}{7}\right)^0-2\frac{4}{9}:\left(\frac{2}{3}\right)^2\)
\(\left(\frac{1}{3}-\frac{5}{6}\right)^2+\frac{5}{6}:2\)
Tìm x
\(\left(\frac{3}{5}-\frac{1}{2}x\right)^2+8=12\)
\(\frac{7}{12}-\left|\frac{1}{3}-\frac{1}{2}x\right|=\frac{1}{3}\)
\(\frac{13}{12}-\frac{1}{3}.\left|\frac{1}{5}-\frac{1}{3}x\right|=\frac{1}{2}\)
Nhanh hộ mình nha
Cảm ơn mn
\(a. (0,2+\frac{1}{9}+\frac{1}{11})=1,4+\frac{7}{9}+\frac{7}{11}\)
\(b. 3|x|-\frac{3}{5}-2|x|=\frac{5}{9} \)
Tìm x biết:
a) \(\frac{1}{4}+\frac{1}{3}:2x=-5\)
b) \(\left(3x-\frac{1}{4}\right).\left(x+\frac{1}{2}\right)=0\)
c) \(|x+\frac{1}{5}|-\frac{1}{2}=\frac{9}{10}\)
d) \(\sqrt{0,81}.\left(\sqrt{x}+\sqrt{\frac{16}{49}}\right)=\frac{9}{10}\)
f) \(|\frac{1}{3}.\sqrt{x+1}-\frac{2}{9}|-\frac{1}{6}=\frac{1}{9}\)
\(3,2.\frac{15}{16}-\left(75\%+\frac{2}{7}\right):\left(-1\frac{1}{28}\right)\)
\(\left(0,25+12,5-\frac{5}{16}\right):\left[12-\frac{7}{12}:\left(\frac{3}{8}-\frac{1}{12}\right)\right]\)
\(\left(\frac{-3}{5}+\frac{5}{11}\right):\frac{-3}{7}+\left(\frac{-2}{5}+\frac{6}{5}\right):\frac{-3}{7}\)
\(14,5-\frac{8}{9}:\left(35-34\frac{8}{9}\right).\frac{9}{8}\)
\(1\frac{1}{15}-\left(\frac{1}{15}+\frac{4}{9}:\frac{-2}{3}-\frac{28}{16}.\frac{6}{35}\right)-\frac{3}{10}\)
Tìm x
\(\left(4,5-2x\right)\left(-3\frac{2}{3}\right)=\frac{11}{15}\)
\(\backslash34-x\backslash=\left(-3\right)^4\)
\(\left(4x^2-1\right)\left(\text{\x}\backslash-\frac{2}{3}\right)=0\)
\(\frac{3}{5}x-\frac{1}{2}\)\(x=\frac{-7}{20}\)
a)4:(X-1)=(X-1):9
b) \(\frac{3^0}{5}+\frac{1}{2}:\left(3-\frac{1}{3}\right)^{\sqrt{9}}+\frac{1}{3}\)
c) \(3\frac{1}{2}:x\cdot\frac{1}{2}=5\frac{1}{3}:\frac{1}{2}\cdot\frac{1}{5}\)
d) /2x-3/=5
e) /2-/3x-1//=5
f)\(\left(2x-\frac{1}{3}\right)^2=\left(1-3x\right)^2\)
g) \(\left(3-\frac{1}{2}:x\right)^2=\frac{1}{4}\)
h) \(\left(1-1\frac{1}{2}x\right)^3=\frac{1}{8}\)
Tìm x thỏa mãn: \(\frac{5}{9}-1\frac{1}{9}\cdot x=\frac{2}{3}-\frac{15}{9}\cdot x\)