Автор - DariaKan

помогите пожалуйста, начиная с 11!! Алгебра 7 класс, пожалуйста!

Ответ

Автор - alesyaperova

11)( frac{10}{3} ) {}^{2}  - ( frac{9}{2} ) {}^{2}  =  frac{100}{9} -  frac{81}{4}  =  \ 11 frac{1}{9}  - 20 frac{1}{4}  = 11 frac{4}{36}  - 20 frac{9}{36}  =
 =  - 9 frac{5}{36}
12) (frac{31}{6} ) {}^{2}  - ( frac{22}{3} ) {}^{2}  =  frac{961}{36}  -  frac{484}{9}  =  \ = 26 frac{25}{36}  - 53 frac{7}{9}  = 26 frac{25}{36}  - 53 frac{28}{36}
 =  - 27 frac{3}{36}  =  - 27 frac{1}{12}
13)(51 - 41)(51 + 41) =  \  = 10 times 92 = 920
14)(54 - 46)(54 + 46) =  \ 8 times 100 = 800
15)(76 - 24)(76 + 24) =  \  = 52 times 100 = 5200
16)(328 - 172)(328 + 172) =  \ 156 times 500 = 78000
17)( frac{11}{3} ) {}^{2}  - ( frac{7}{3} ) {}^{2}  =  frac{121}{9}  -  frac{49}{9}  \ 13 frac{4}{9}  - 5 frac{4}{9}  = 8
18) (frac{68}{9} ) {}^{2}  - ( frac{40}{9} ) {}^{2}  = ( frac{68}{9}  -  frac{40}{9} ) times  \( frac{68}{9}  +  frac{40}{9}) =  frac{28}{9}  times  frac{108}{9}  =
,
 =  frac{28 times 12}{9}  =  frac{28 times 4}{3}  =  frac{112}{3}  = 37 frac{1}{3}

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