Câu 1:
a: \(-\frac23\cdot\frac97+\frac34:2,5\)
\(=-\frac{18}{21}+\frac34:\frac52\)
\(=-\frac67+\frac34\cdot\frac25=-\frac67+\frac{3}{10}=\frac{-60+21}{70}=\frac{-39}{70}\)
b: \(\left(\frac35\right)^2-\left\lbrack\frac13:3-\sqrt{16}\cdot\left(\frac12\right)^2\right\rbrack-\left(10\cdot12-2014\right)^0\)
\(=\frac{9}{25}-\left\lbrack\frac19-4\cdot\frac14\right\rbrack-1\)
\(=\frac{9}{25}-\frac19+1-1=\frac{9}{25}-\frac19=\frac{81-25}{225}=\frac{56}{225}\)
c: \(5\cdot\sqrt{\frac{1}{25}}-3\cdot\sqrt{\frac19}\)
\(=5\cdot\frac15-3\cdot\frac13\)
=1-1
=0
Câu 2:
a: \(\frac54+x=-\frac14\)
=>\(x=-\frac14-\frac54=-\frac64=-\frac32\)
