Помогите заданиеммм 6 кл .срочно

4)(5,4-2 $\frac{1}{3}$ ):7 $\frac{2}{3}$ =( $\frac{54}{10}$ - $\frac{7}{3}$ ): $\frac{23}{3}$ =( $\frac{27}{5}$ - $\frac{7}{3}$ ): $\frac{23}{3}$ =( $\frac{81-35}{15}$ ): $\frac{23}{3}$ = $\frac{46}{15}$ : $\frac{23}{3}$ = $\frac{46*3}{15*23}$ =2/5=4/10=0,4
5)( $\frac{7}{3}$ - $\frac{25}{100}$ )* $\frac{12}{100}$ =( $\frac{7}{3}$ - $\frac{1}{4}$ )* $\frac{3}{25}$ =( $\frac{28-3}{12}$ )* $\frac{3}{25}$ = $\frac{25*3}{12*25}$ =1/4=0,25
6)( $\frac{76}{10}$ - $\frac{19}{4}$ ): $\frac{19}{10}$ =( $\frac{38}{5}$ - $\frac{19}{4}$ ): $\frac{19}{10}$ =( $\frac{152-95}{20}$ ): $\frac{19}{10}$ = $\frac{57}{20}$ : $\frac{19}{10}$ = $\frac{57*10}{20*19}$ =3/2=1,5