\(\frac{2x+1}{-3}=\frac{-7}{11}\)
\(\Leftrightarrow11\left(2x+1\right)=\left(-3\right).\left(-7\right)\)
\(\Leftrightarrow2x+1=\frac{21}{11}\)
\(\Leftrightarrow2x=\frac{21}{11}-1\)
\(\Leftrightarrow2x=\frac{10}{11}\)
\(\Leftrightarrow x=\frac{5}{11}\)
Vậy..
B=\(\frac{1}{3}-\frac{3}{4}-\left(-0,6\right)+\frac{1}{64}-\frac{2}{9}-\frac{1}{36}+\frac{1}{15}\)
C=\(\frac{1}{3}-\frac{3}{5}+\frac{5}{7}-\frac{7}{9}+\frac{9}{11}-\frac{11}{13}+\frac{13}{15}+\frac{11}{15}+\frac{11}{13}-\frac{9}{11}+\frac{7}{9}-\frac{5}{7}+0,6-\frac{1}{3}\)
D=\(\frac{1}{99}-\frac{1}{99.98}-\frac{1}{98.97}.....-\frac{1}{3.2}-\frac{1}{2.1}\)
Bài 1: Tìm x:
a) x - \(\frac{4}{5}=\frac{7}{10}-\frac{3}{4}\)
b)\(2\frac{1}{3}-x=\frac{-5}{9}+2x\)
c) \(\frac{x+3}{2016}+\frac{x+2}{2017}=\frac{x+1}{2018}+\frac{x}{2019}\)
d) \(\frac{1}{x\left(x+1\right)}+\frac{1}{\left(x+1\right)\left(x+2\right)}+\frac{1}{\left(x+2\right)\left(x+3\right)}-\frac{1}{x}=\frac{1}{2010}\)
-Mấy bạn giúp mik nha vì mik học thêm môn toán lớp 7?
bài 1: Tìm x, biết:
a) l\(^{x-\frac{1}{3}l=2\frac{1}{5}}\)
b) \(l+\frac{2}{5}l+\frac{1}{2}=3,5\)
c) l\(x+\frac{1}{4}l-\frac{3}{4}=5\%\)
1)Rút gọn
a) /x-3/+/x-5/ với(3<x<5)
b)/2x+1/-/2x+1/ với x>\(\frac{-1}{2}\)
Tìm x biết :
1) \(\frac{x+1}{15}\)+ \(\frac{x+2}{14}\)=\(\frac{x+3}{13}\)+\(\frac{x+4}{12}\)
2) \(\frac{x+1}{2012}\)+\(\frac{x+2}{2011}\)+\(\frac{x+3}{2010}\)=\(\frac{x+4}{2009}\)+\(\frac{x+5}{2008}\)+\(\frac{x+6}{2007}\)
3)\(\frac{x-2}{2013}\)+\(\frac{x-1}{2014}\)=\(\frac{x-3}{2012}\)+\(\frac{x-4}{2011}\)
4)\(\frac{x-3}{20}\)+\(\frac{x-2}{21}\)=\(\frac{x-1}{22}\)+\(\frac{x}{23}\)
5)\(\frac{x+1}{20}\)+\(\frac{x+2}{19}\)+\(\frac{x+3}{18}\)= -3
6) \(\frac{x-1}{91}\)+\(\frac{x-2}{90}\)+\(\frac{x-3}{89}\)+\(\frac{x-4}{88}\)= 5
Ai giúp mình vs...Cả đống bài tập mà chẳng biết làm gì hết
Ai làm giúp mình sẽ tick nhé
2x-3=x+\(\frac{1}{2}\)
1)Tính nhanh giá trị biểu thức
A=\(\frac{1}{3}-\frac{3}{4}-\left(\frac{-3}{5}\right)+\frac{1}{64}-\frac{2}{9}-\frac{1}{36}+\frac{1}{15}\)
B=\(\left(\frac{-1}{2}\right)-\left(\frac{-3}{5}\right)+\left(\frac{-1}{9}\right)+\frac{1}{131}-\left(\frac{-2}{7}\right)+\frac{4}{35}-\frac{7}{18}\)
tìm x , biết
a) 17/6- x( x-7/6)= 7/4
b) 3/35 - ( 3/5-x)= 2/7
tìm x thuộc Z , biết
3/4-5/6 < x/12 < 1 -( 2/3-1/4)
tìm x biết
a ) 2x-3=x + 1/2
b) 4x- ( x+ 1/2) = 2x - ( 1/2 - 5 )
tìm x ∈ N, biết:
\(\frac{1}{4}\)+ \(\frac{8}{9}\)≤ \(\frac{x}{36}\)< 1- (\(\frac{3}{8}\)- \(\frac{5}{6}\))
