bài 3: giúp mình với làm ơn

a, 1,25 . \(\left[-3\frac{3}{8}\right]\) b, \(\frac{-9}{34}.\frac{17}{4}\)

c, \(\frac{-20}{41}.\frac{-4}{5}\) d, \(\frac{-6}{7}.\frac{21}{2}\)

bài 4:

a, \(\frac{-5}{2}.\frac{3}{4}\) b,\(4\frac{1}{5}:\left[-2\frac{4}{5}\right]\)

c,\(1,8:\left[\frac{-3}{4}\right]\) d,\(\frac{17}{15}:\frac{4}{3}\)

bài 1:

\(a,\frac{3}{8}+\frac{-5}{6}\)

b, \(\frac{15}{12}-\frac{-1}{4}\)

bài 2:

a,\(\frac{-1}{12}-\left(2\frac{5}{8}-\frac{1}{3}\right)\) c, \(-1,75-\left(\frac{-1}{9}-2\frac{1}{18}\right)\)

b, \(\frac{-5}{6}-\left[\frac{-3}{8}+\frac{1}{10}\right]\) d,

a, B= 50%.1\(\frac{1}{3}\).20.\(\frac{7}{35}\).0,75

bài 2

a, \(\frac{1}{3}x+13\frac{1}{4}=16\frac{1}{4}\)

b, \(\frac{1}{3}+\frac{2}{3}x=\frac{-1}{4}\)