\(\frac{7}{9}\)x\(\frac{3}{4}:\frac{5}{8}\)
Giup mik nhé!
Tìm x biết:
\(2-\left(5\frac{3}{8}+x-7\frac{5}{24}\right):16\frac{2}{3}=0\)
Giup mik với mik đag gấp lắm mik like cho nha giải chi tiết nhé
\(2-\left(5\frac{3}{8}+x-7\frac{5}{24}\right)\)\(:16\frac{2}{3}=0\)
\(\Rightarrow\)\(2-\left(5\frac{3}{8}+x-7\frac{5}{24}\right)=0\)
\(\Rightarrow\)\(5\frac{3}{8}+x-7\frac{5}{24}=2\)
\(\Rightarrow5\frac{3}{8}+x=9\frac{5}{24}\)
\(\Rightarrow x=3\frac{5}{6}\)
( Cách làm thì đúng rồi nhưng đáp án tớ ko chắc chắn )
tim x
a)\(-\frac{3}{4}x+\frac{1}{6}x=1-2\frac{5}{9}\)
b)\(\left|2x-\frac{3}{8}\right|+2\frac{3}{4}=3\frac{1}{16}\)
giup mik vs
a) \(-\frac{3}{4}x+\frac{1}{6}x=1-2\frac{5}{9}\)
\(\left(-\frac{3}{4}+\frac{1}{6}\right).x=1-\frac{23}{9}\)
\(-\frac{7}{12}.x=-\frac{14}{9}\)
\(x=-\frac{14}{9}:\left(-\frac{7}{12}\right)\)
\(x=\frac{8}{3}\)
Vậy x = ...
b) \(\left|2x-\frac{3}{8}\right|+2\frac{3}{4}=3\frac{1}{16}\)
\(\left|2x-\frac{3}{8}\right|+\frac{11}{4}=\frac{49}{16}\)
\(\left|2x-\frac{3}{8}\right|=\frac{49}{16}-\frac{11}{4}\)
\(\left|2x-\frac{3}{8}\right|=\frac{5}{16}\)
\(\Rightarrow\left|2x-\frac{3}{8}\right|\in\text{{}\frac{5}{16};-\frac{5}{16}\)}
Nếu, \(2x-\frac{3}{8}=\frac{5}{16}\)
\(2x=\frac{11}{16}\)
\(x=\frac{11}{32}\)
Nếu, \(2x-\frac{3}{8}=-\frac{5}{16}\)
\(2x=\frac{1}{16}\)
\(x=\frac{1}{32}\)
Vậy \(x\in\text{{}\frac{1}{32};\frac{11}{32}\)}
1/Thực hiện phép tính
a) \(\left(\frac{2}{5}+\frac{-5}{8}\right):\frac{11}{30}+\frac{1}{8}\)
b) \(\frac{4}{9}+\frac{7}{12}:\frac{3}{8}-\left(\frac{-5}{6}\right)\)
c)\(\left(\frac{2}{5}+\frac{-5}{8}\right):\frac{24}{5}+\left(\frac{13}{8}+\frac{18}{5}\right):\frac{24}{5}\)
d)\(\frac{4}{2\cdot5}+\frac{4}{5\cdot8}+\frac{4}{8\cdot11}...+\frac{4}{20\cdot23}+\frac{4}{23\cdot26}\)
Câu 2: Tìm x
a) \(4\frac{1}{2}+x=5-0,3\)
b)\(\frac{7}{9}-\frac{2}{5}x=\frac{3}{4}x-\frac{1}{6}\)
c)\(\frac{7}{12}-\left(x+70\%\right):1,2=\frac{-5}{4}\)
d)\(|\frac{5}{8}x+\frac{6}{7}|-\frac{4}{7}=\frac{10}{7}\)
Mik cần gấp nhé! Ai nhanh mik tick
Bài 1:
a) b) c) sẽ có bạn giải cho em thôi vì nó dễ tính tay cũng đc
d) \(\frac{4}{2.5}+\frac{4}{5.8}+...+\frac{4}{23.26}\)
\(=\frac{4}{3}.\left(\frac{3}{2.5}+\frac{3}{5.8}+...+\frac{3}{23.26}\right)\)
\(=\frac{4}{3}.\left(\frac{1}{2}-\frac{1}{5}+\frac{1}{5}-\frac{1}{8}+...+\frac{1}{23}-\frac{1}{26}\right)\)
\(=\frac{4}{3}.\left(\frac{1}{2}-\frac{1}{26}\right)\)
\(=\frac{4}{3}.\frac{6}{13}\)
\(=\frac{8}{13}\)
Bài 2:
a) b) c)
d)\(|\frac{5}{8}x+\frac{6}{7}|-\frac{4}{7}=\frac{10}{7}\)
\(\Leftrightarrow|\frac{5}{8}x+\frac{6}{7}|=2\)
\(\Leftrightarrow\orbr{\begin{cases}\frac{5}{8}x+\frac{6}{7}=2\\\frac{5}{8}x+\frac{6}{7}=-2\end{cases}}\)\(\Leftrightarrow\orbr{\begin{cases}\frac{5}{8}x=\frac{8}{7}\\\frac{5}{8}x=\frac{-20}{7}\end{cases}\Leftrightarrow\orbr{\begin{cases}x=\frac{64}{35}\\x=\frac{-32}{7}\end{cases}}}\)
Vậy \(x\in\left\{\frac{64}{35};\frac{-32}{7}\right\}\)
Bài 1 :
a) \(\left(\frac{2}{5}-\frac{5}{8}\right):\frac{11}{30}+\frac{1}{8}\)
\(=\frac{-9}{40}:\frac{11}{30}+\frac{1}{8}\)
\(=\frac{-27}{44}+\frac{1}{8}\)
\(=\frac{-43}{88}\)
Bài 1 :
b) \(\frac{4}{9}+\frac{7}{12}:\frac{3}{8}-\left(\frac{-5}{6}\right)\)
\(=\frac{4}{9}+\frac{14}{9}+\frac{5}{6}\)
\(=\frac{17}{6}\)
a, \(x-\left[\frac{17}{2}-\left(\frac{-3}{7}+\frac{5}{3}\right)\right]=\frac{-1}{3}\)
b,\(\frac{9}{2}-\left[\frac{2}{3}-\left(x-\frac{7}{4}\right)\right]=\frac{-5}{4}\)
giúp mik với nhé !!! bài khó mik ko làm đc
x-[17/2-6/35]=-1/3
x-583/70=-1/3
x=-1/3+583/70
x=1679/210
vậy x=1769/210
[2/3-(x-7/4)]=9/2+5/4
[2/3-(x-7/4)]=23/4
(x-7/4)=23/4+2/3
(x-7/4)=77/12
x=77/12+7/4
x=49/6
vậy x=49/6
a\(\left(1+2\frac{1}{4}-3\frac{1}{3}\right):\left(1+3\frac{1}{2}-4\frac{7}{12}\right)\)
b)\(5\frac{1}{2}-14\frac{3}{7}:\frac{9}{13}-3\frac{4}{7}:\frac{9}{13}\)
giup mik vs a
\(\frac{13}{15}\)\(-\left(\frac{13}{21}+x\right)\)\(.\frac{7}{12}\)\(=\frac{7}{10}\)
\(\left(4\frac{5}{37}-3\frac{4}{5}+8\frac{15}{23}\right)\)\(-\left(3\frac{5}{37}-6\frac{14}{29}\right)\)
GIUP MIK ROI MIK TICK CHO
tính
a, \(\frac{-5}{6}:\frac{-6}{7}:\frac{-7}{8}:\frac{-8}{9}:\frac{-9}{10}\)
b,\(\frac{-4}{25}:\frac{11}{79}+\frac{15}{11}:\frac{25}{79}\)
nhanh mik tick nhé
tính nhanh
\(\frac{1}{2}+\frac{2}{3}+\frac{3}{4}+\frac{4}{5}+\frac{5}{6}+\frac{6}{7}+\frac{7}{8}+\frac{8}{9}+\frac{9}{10}\)\(\frac{9}{10}\)
ai nhanh mik tik nha
1/2+2/3+3/4+4/5+5/6+6/7+7/8+8/9+9/10x9/10
=9/10x(1/2+2/3)+(3/4+4/5)+(5/6+6/7)+(7/8+8/9)
=9/10x(1/3+3/5+5/7+7/9)
9/10x(1/3+3/5)+(5/7+7/9)
=9/10x1/5+5/9
9/50+5/9
=10
Bn Long làm đúng rồi bn nguyễn kim arica cứ làm theo cách đó là được .
Bn nào thấy đúng thì ủng hộ nha .
hình như đề bạn sai thì phải đúng ko biết ngỏ bạn làm
cái chỗ có 2 phân số 9/10 đấy
1.tính (nhanh nếu có thể)
a) \(\frac{3}{11}x\frac{13}{5}-\frac{3}{5}x\frac{8}{11}\)
b)\(\left(\frac{2}{5}+\frac{1}{4}\right)x\left(\frac{2}{11}-\frac{7}{11}\right)\)
c)\(\frac{2}{7}+\frac{5}{7}-\frac{14}{15}\)
các bạn nhanh giúp mik nhé,mik gấp lắm rồi