a) \(\left(x-\frac{1}{2}\right).\frac{1}{3}+\frac{5}{7}=9\frac{5}{7}\)
\(\left(x-\frac{1}{2}\right).\frac{1}{3}=9\frac{5}{7}-\frac{5}{7}\)
\(x-\frac{1}{2}=9:\frac{1}{3}\)
\(x=27+\frac{1}{2}\)
\(x=\frac{55}{2}\)
b)\(\frac{1}{2}.x+150\%.x=2014\)
\(\left(\frac{1}{2}+150\%\right)x=2014\)
\(2x=2014\)
\(x=2014:2\)
\(x=1007\)
c) \(2-\left|\frac{3}{4}\right|=\frac{7}{2}\)???????
và bài này nữa
tính nhanh
a, \(5\frac{7}{5}\cdot4\frac{2}{7}+5\frac{5}{7}\cdot4\frac{2}{7}\)
b, \(b,\frac{-7}{11}\cdot\frac{4}{19}+\frac{-7}{19}\cdot\frac{7}{11}+2\frac{7}{19}\)
cảm ơn giúp nhiều
\(a,\left(x-\frac{1}{2}\right)\frac{1}{3}+\frac{5}{7}=9\frac{5}{7}\)
\(\Rightarrow\frac{x}{3}-\frac{1}{6}+\frac{5}{7}=\frac{68}{7}\)
\(\Rightarrow\frac{x}{3}-\frac{1}{6}=\frac{63}{7}=9\)
\(\Rightarrow\frac{x}{3}=9+\frac{1}{6}=\frac{55}{6}\)
\(\Rightarrow x=55:2=27,5\)
\(b,\frac{1}{2}.x+150\%.x=2014\)
\(\Rightarrow\frac{x}{2}+\frac{3}{2}.x=2014\)
\(\Rightarrow2x=2014\)
\(\Rightarrow x=2014:2=1007\)
\(c,2-\left|\frac{3}{4}\right|=\frac{7}{12}\)
a, ( x-1/2).1/3+5/7=9 5/7
(x-1/2).1/3+5/7=68/7
( x-1/2).1/3=68/7-5/7
( x-1/2).1/3=9
x-1/2=9:1/3
x-1/2=9.3
x-1/2=27
x=27+1/2
x= 54/2 + 1/2
x= 55/2
b, 1/2.x +150%.x=2014
1/2.x+3/2.x=2014
x.(1/2+3/2)=2014
x.2=2014
x=2014:2
x=1007