\(5\frac{4}{7}:x=13\)

=> \(x=\frac{39}{7}:13\)

=> \(x=\frac{3}{7}\)

\(\frac{2}{3}x-0,5x=\frac{5}{12}\)

\(\Leftrightarrow x\left(\frac{2}{3}-0,5\right)=\frac{5}{12}\)

\(\Leftrightarrow x\left(\frac{4}{6}-\frac{3}{6}\right)=\frac{5}{12}\)

\(\Leftrightarrow\frac{1}{6}x=\frac{5}{12}\)

\(\Leftrightarrow x=\frac{5}{12}\div\frac{1}{6}\)

\(\Leftrightarrow x=\frac{5}{2}\)

\(1\frac{13}{15}.0,75-\left(\frac{11}{20}+\frac{25}{100}\right):\frac{3}{7}\)

= \(\frac{7}{5}-\frac{4}{5}:\frac{3}{7}\)

= \(\frac{7}{5}-\frac{28}{15}\)

= \(-\frac{7}{15}\)

\(1\frac{13}{15}\cdot0,75-\left(\frac{11}{20}+\frac{25}{100}\right):\frac{3}{7}\)

=>\(\frac{28}{15}\cdot\frac{3}{4}-\left(\frac{55}{100}+\frac{25}{100}\right)\cdot\frac{7}{3}\)

=>\(\frac{84}{60}-\frac{80}{100}\cdot\frac{7}{3}\)

=>\(\frac{7}{5}-\frac{4}{5}\cdot\frac{7}{3}=\frac{7}{5}-\frac{28}{15}\)

=>\(\frac{7}{5}-\frac{18}{14}=\frac{98}{60}-\frac{90}{60}=\frac{8}{60}=\frac{4}{30}\)

a) Trên nửa mp chứa tia Ox có \(\widehat{xOy}< \widehat{xOz}\)\(\left(60^0< 90^0\right)\)

Suy ra Oy nằm giữa \(\widehat{xOz}\)

Do đó \(\widehat{xOy}+\widehat{yOz}=\widehat{xOz}\)

    Hay \(60^0+\widehat{yOz}=90^0\)

                       \(\widehat{yOz}=90^0-60^0\)

                           \(\widehat{yOz}=30^0\)

b) Vì \(\widehat{yOx}\)và \(\widehat{xOy'}\)là hai góc kề bù

Do đó:\(\widehat{yOx}+\widehat{xOy'}=\widehat{yOy'}\)

          \(60^0+\widehat{xOy'}=180^0\)

                         \(\widehat{xOy'}=180^0-60^0\)

                         \(\widehat{xOy'}=120^0\)

................. the air is cleaner, people will have less breathing problems

A. Unless            B. When                C. If                 D. Because

chuc ban hoc tot nha

.................. the air is cleaner, people will have less breathing problems

A. Unless            B. When                C. If                  D. Because

chia dong tu trong ngoac

34.Do your children (have)...have......., EL class three times a week?

35. Don't worry. The taxi (arrive)..is arriving....................... in a few minutes

36. Trump is whashing his hands. He (just/repair)...has just repaired..... his car

37. Did you (go)..........go......... out lastnight?-no, I was at home with my son

39. Are you fond of (get).getting..... a long trip to the Southern by train, John?

giup mk nha

Do your children have...?

the taxi will arrive.....

he has just repaired.....

did you go ....

getting

quá chuẩn bạn ơi

THANK YOU VERY MUCH

help me!!! nhanh lên mk cần gấp

ai đúng mk k cho !!!!