Question

bài 2:

a,\(6\frac{4}{5}\)-(\(1\frac{2}{3}\)+\(3\frac{4}{5}\))

b,\(6\frac{5}{7}\)-(\(1\frac{3}{4}\)+\(2\frac{5}{7}\))

c,\(7\frac{5}{9}\)-(\(2\frac{3}{4}\)+\(3\frac{5}{9}\))

d,\(7\frac{5}{11}\)-(\(2\frac{3}{7}\)+\(3\frac{5}{11}\))

e,\(\frac{-3}{5}\).\(\frac{5}{7}\)+\(\frac{-3}{5}\).\(\frac{15}{19}\)+\(\frac{5}{7}\)

f,\(\frac{1}{3}\).\(\frac{4}{5}\)+\(\frac{1}{3}\).\(\frac{6}{5}\)-\(\frac{4}{3}\)

g,\(\frac{4}{19}\).\(\frac{-3}{7}\)+\(\frac{-3}{7}\).\(\frac{15}{19}\)+\(\frac{5}{7}\)

h,\(\frac{5}{9}\).\(\frac{7}{13}\)+\(\frac{5}{9}\).\(\frac{9}{13}\)-\(\frac{5}{9}\).\(\frac{3}{13}\)

mn ơi,giúp mk với ạ,mk cần gấp

Answer 1

Các câu này dễ mà bn tự lm đi

Answer 2

a)\(6\frac45-\left(1\frac23+3\frac45\right)\)

=\(6\frac45-1\frac23-3\frac45\)

=\(\left(6-3\right)-\left(\frac45-\frac45\right)-1\frac23\)

=\(3-\frac53\)

=\(\frac93-\frac53\)

=\(\frac43\)

Answer 3

b)\(6\frac57-\left(1\frac34+2\frac57\right)\)

=\(6\frac57-1\frac34-2\frac57\)

=\(\left(6-2\right)+\left(\frac57-\frac57\right)-1\frac34\)

=\(4+0-\frac74\)

=\(\frac{16}{4}-\frac74\)

=\(\frac94\)

Answer 4

c)\(7\frac59-\left(2\frac34+3\frac59\right)\)

=\(7\frac59-2\frac34-3\frac59\)

=\(\left(7-2\right)+\left(\frac59-\frac59\right)-2\frac34\)

=\(+0-\frac{11}{4}\)

=\(\frac{16}{4}-\frac{11}{4}\)

=\(\frac54\)

Answer 5

d)\(7\frac{5}{11}-\left(2\frac37+3\frac{5}{11}\right)\)

=\(7\frac{5}{11}-2\frac37-3\frac{5}{11}\)

=\(\left(7-3\right)+\left(\frac{5}{11}-\frac{5}{11}\right)-2\frac37\)

=\(4+0-\frac{17}{7}\)

=\(\frac{28}{7}-\frac{17}{7}\)

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

Answer 6

e)\(\frac{-3}{5}\times\frac57+\frac{-3}{5}\times\frac{15}{19}+\frac57\)

=\(\left(-\frac35+1\right)\times\frac57+\frac{-3}{5}\times\frac{15}{19}\)

=\(\left(-\frac35+\frac55\right)\times\frac57+\frac{-9}{19}\)

=\(\frac25\times\frac57+\frac{-9}{19}\)

=\(\frac27+\frac{-9}{19}\)

=\(\frac{38}{133}-\frac{63}{133}\)

=\(\frac{-25}{133}\)

=

Answer 7

f)\(\frac13\times\frac45+\frac13\times\frac65-\frac43\)

=\(\frac13\times\frac45+\frac13\times\frac65-\frac13\times4\)

=\(\frac13\times\left(\frac45+\frac65-4\right)\)

=\(\frac13\times\left(\frac{10}{5}-4\right)\)

=\(\frac13\times\left(2-4\right)\)

=\(\frac13\times\left(-2\right)\)

=\(\frac{-2}{3}\)

Answer 8

g)\(\frac{4}{19}\times\frac{-3}{7}+\frac{-3}{7}\times\frac{15}{19}+\frac57\)

=\(\frac{-3}{7}\times\left(\frac{4}{19}+\frac{15}{19}\right)+\frac57\)

=\(\frac{-3}{7}\times1+\frac57\)

=\(\frac{-3}{7}+\frac57\)

=\(\frac27\)

Answer 9

h)\(\frac59\times\frac{7}{13}+\frac59\times\frac{9}{13}-\frac59\times\frac{3}{13}\)

=\(\frac59\times\left(\frac{7}{13}+\frac{9}{13}-\frac{3}{13}\right)\)

=\(\frac59\times1\)

=\(\frac59\)