Question

 

Giúp vs ạ cảm ơn trc ạ!      Trình bày đầy đủ

Answer 1

b) \(5\frac{1}{4}.\frac{3}{8}+10\frac{3}{4}.\frac{3}{8}\)

\(=\left(5\frac{1}{4}+10\frac{3}{4}\right).\frac{3}{8}\)

\(=16.\frac{3}{8}=6\)

Answer 2

c) \(6\frac{1}{5}.\frac{-2}{7}+14\frac{4}{5}.\frac{-2}{7}\)

\(=\left(6\frac{1}{5}+14\frac{4}{5}\right).\frac{-2}{7}\)

\(=21.\frac{-2}{7}=-6\)

Answer 3

a) \(4\frac{1}{3}.\frac{4}{9}-13\frac{2}{3}.\frac{4}{9}\)

\(=\left(4\frac{1}{3}-13\frac{2}{3}\right).\frac{4}{9}\)

\(=\frac{-28}{3}.\frac{4}{9}=\frac{-28}{3}.\frac{4}{9}\)

\(=\frac{-112}{27}\)

Answer 4

d) \(7\frac{1}{6}.\frac{-7}{6}+10\frac{5}{6}.\frac{-7}{6}\)

\(=\left(7\frac{1}{6}+10\frac{5}{6}\right).\frac{-7}{6}\)

\(=18.\frac{-7}{6}=-21\)

Answer 5

e) \(\frac{5}{7}.\frac{5}{11}+\frac{5}{7}.\frac{2}{11}-\frac{5}{7}.\frac{14}{11}\)

\(=\frac{5}{7}.\left(\frac{5}{11}+\frac{2}{11}-\frac{14}{11}\right)\)

\(=\frac{5}{7}.\frac{7}{11}=\frac{5}{11}\)

Answer 6

f) \(19\frac{5}{8}:\frac{7}{12}-15\frac{1}{4}:\frac{7}{12}\)

\(=\left(19\frac{5}{8}-15\frac{1}{4}\right):\frac{7}{12}\)

\(=\frac{35}{8}:\frac{7}{12}=7\frac{1}{12}\)

Answer 7

Bạn ơi , phần f mình nhầm nhé , kết quả cuối là \(7\frac{1}{2}\) nhé ( Mình đánh máy hơi nhanh nên nhầm )

g) \(\frac{2}{5}.\frac{1}{3}-\frac{2}{15}:\frac{1}{5}+\frac{3}{5}.\frac{1}{3}\)

\(=\frac{2}{5}.\frac{1}{3}-2.\frac{1}{3}+\frac{3}{5}.\frac{1}{3}\)

\(=\left(\frac{2}{5}-2+\frac{3}{5}\right).\frac{1}{3}\)

\(=-1.\frac{1}{3}=\frac{-1}{3}\)

Answer 8

h) \(\frac{4}{9}.19\frac{1}{3}-\frac{4}{9}.39\frac{1}{3}\)

\(=\frac{4}{9}.\left(19\frac{1}{3}-39\frac{1}{3}\right)\)

\(=\frac{4}{9}.\left(-20\right)=\frac{-80}{9}\)