Question

câu 1 thực hiện phép tính (tính nhanh nếu có thể)

a,\(\frac{-7}{25}\).\(\frac{11}{13}\)+\(\frac{-7}{25}\).\(\frac{2}{13}\)-\(\frac{18}{25}\)                                        c,5 \(\frac{2}{5}\). 4\(\frac{2}{7}\)+ 5\(\frac{5}{7}\). 5\(\frac{2}{5}\)

giải hộ mik vs

Answer 1

\(\frac{-7}{25}.\frac{11}{13}+\frac{-7}{25}.\frac{2}{13}-\frac{18}{25}\)

\(=\frac{-7}{25}.\left(\frac{11}{13}+\frac{2}{13}\right)-\frac{18}{25}\)

\(=\frac{-7}{25}.1-\frac{18}{25}\)

\(=\frac{-7}{25}-\frac{18}{25}\)

\(=-1\)

Answer 2

\(5\frac{2}{5}.4\frac{2}{7}+5\frac{5}{7}.5\frac{2}{5}\)

\(=5\frac{2}{5}.\left(4\frac{2}{7}+5\frac{5}{7}\right)\)

\(=5,4.10=54\)

Answer 3

a) \(\frac{-7}{25}\)\(.\)\(\frac{11}{13}\)\(+\)\(\frac{-7}{25}\)\(.\)\(\frac{2}{13}\)\(-\)\(\frac{18}{25}\)

\(=\)\(\frac{-7}{25}\)\(.\)\(\left(\frac{11}{13}+\frac{2}{13}\right)\)\(-\)\(\frac{18}{25}\)

\(=\)\(\frac{-7}{25}\)\(.\)\(1\)\(-\)\(\frac{18}{25}\)

\(=\)\(\frac{-7}{25}\)\(-\)\(\frac{18}{25}\)

\(=\)\(-1\)

b) \(5\frac{2}{5}\)\(.\)\(4\frac{2}{7}\)\(+\)\(5\frac{5}{7}\)\(.\)\(5\frac{2}{5}\)

\(=\)\(5\frac{2}{5}\)\(.\)\(\left(4\frac{2}{7}+5\frac{5}{7}\right)\)

\(=\)\(5,4\)\(.\)\(10\)

\(=\)\(54\)

Answer 4

= -1 nha