(у+9)(у-2)+(3-у)(6+5у)
у=-1/2
(-1/2+9)((-1/2)-2)+(3-(-1/2)(6+5(-1/2)= -9
Пошаговое объяснение:
- 1/ 2 + 9 = 9 - 1 /2 = 9·2 2 - 1 /2 = 18 /2 - 1/ 2 = 18 - 1/ 2 = 17/ 2 = 8·2 + 1 /2 = 8 1 /2 = 8.5
- 1 /2 - 2 = -2 1 /2 = -2.5
3 - (- 1 /2 ) = 3 + 1/ 2 = 3 + 1/ 2 = 3 1/ 2 = 3.5
5×(- 1 /2 ) = -5× 1/ 2 = - 5·1 /2 = - 5 /2 = - 2·2 + 1 /2 = -2 1 /2 = -2.5
8 1 2 ×(-2 1 /2 ) = -8 1 /2 ×2 1/2 = - 1 + 8·2 /2 × 1 + 2·2 /2 = - 17 2 × 5 /2 = - 17·5/ 2·2 = - 85 /4 = - 21·4 + 1 /4 = -21 1 /4 = -21.25
6 + (-2/ 1 2 ) = 6 - 2 / 1 2 = 6 - 2 - 1 /2 = 4 - 1 2 = 4·2 2 - 1 2 = 8 2 - 1 2 = 8 - 1 2 = 7 2 = 3·2 + 1 2 = 3 / 1 2 = 3.5
3 1 2 ×3 1 2 = 1 + 3·2 2 × 1 + 3·2 2 = 7 2 × 7 2 = 7·7 2·2 = 49 4 = 12·4 + 1 4 = 12 1 4 = 12.25
-21 1 4 + 12 1 4 = 12 1 4 - 21 1 4 = 1 + 12·4 4 - 1 + 21·4 4 = 49 4 - 85 4 = 49 - 85 4 = - 36 4 = - 9 · 4 4 = - 9 = -9
Переводим смешанные дроби в неправильные:
1) (x - \frac{48}{13}) + \frac{75}{13} = \frac{160}{13}
(x - \frac{48}{13}) = \frac{160}{13} - \frac{75}{13}
(x-\frac{48}{13}) = \frac{85}{13}
x = \frac{85}{13} + \frac{48}{13}
x = \frac{133}{13}
2) (\frac{57}{16} - y) + \frac{73}{16} = \frac{87}{16}
(\frac{57}{16} - y) = \frac{87}{16} - \frac{73}{16}
(\frac{57}{16} - y) = \frac{14}{16}
y = \frac{14}{16} + \frac{57}{16}
y = \frac{71}{16}
y = 4,4375
3) \frac{367}{27} + (x-\frac{71}{27}) = \frac{815}{27}
(x-\frac{71}{27}) = \frac{815}{27} - \frac{367}{27}
(x-\frac{71}{27}) = \frac{448}{27}
x = \frac{448}{27} + \frac{71}{27}
x = \frac{519}{27}
4) (y - \frac{54}{25}) + \frac{107}{25} = \frac{356}{25}
(y - \frac{54}{25}) = \frac{356}{25} - \frac{107}{25}
(y-\frac{54}{25}) = \frac{249}{25}
y = \frac{249}{25} + \frac{54}{25}
y = \frac{303}{25}
y = 12,12
(у+9)(у-2)+(3-у)(6+5у)
у=-1/2
(-1/2+9)((-1/2)-2)+(3-(-1/2)(6+5(-1/2)= -9
Пошаговое объяснение:
- 1/ 2 + 9 = 9 - 1 /2 = 9·2 2 - 1 /2 = 18 /2 - 1/ 2 = 18 - 1/ 2 = 17/ 2 = 8·2 + 1 /2 = 8 1 /2 = 8.5
- 1 /2 - 2 = -2 1 /2 = -2.5
3 - (- 1 /2 ) = 3 + 1/ 2 = 3 + 1/ 2 = 3 1/ 2 = 3.5
5×(- 1 /2 ) = -5× 1/ 2 = - 5·1 /2 = - 5 /2 = - 2·2 + 1 /2 = -2 1 /2 = -2.5
8 1 2 ×(-2 1 /2 ) = -8 1 /2 ×2 1/2 = - 1 + 8·2 /2 × 1 + 2·2 /2 = - 17 2 × 5 /2 = - 17·5/ 2·2 = - 85 /4 = - 21·4 + 1 /4 = -21 1 /4 = -21.25
6 + (-2/ 1 2 ) = 6 - 2 / 1 2 = 6 - 2 - 1 /2 = 4 - 1 2 = 4·2 2 - 1 2 = 8 2 - 1 2 = 8 - 1 2 = 7 2 = 3·2 + 1 2 = 3 / 1 2 = 3.5
3 1 2 ×3 1 2 = 1 + 3·2 2 × 1 + 3·2 2 = 7 2 × 7 2 = 7·7 2·2 = 49 4 = 12·4 + 1 4 = 12 1 4 = 12.25
-21 1 4 + 12 1 4 = 12 1 4 - 21 1 4 = 1 + 12·4 4 - 1 + 21·4 4 = 49 4 - 85 4 = 49 - 85 4 = - 36 4 = - 9 · 4 4 = - 9 = -9
Переводим смешанные дроби в неправильные:
1) (x - \frac{48}{13}) + \frac{75}{13} = \frac{160}{13}
(x - \frac{48}{13}) = \frac{160}{13} - \frac{75}{13}
(x-\frac{48}{13}) = \frac{85}{13}
x = \frac{85}{13} + \frac{48}{13}
x = \frac{133}{13}
2) (\frac{57}{16} - y) + \frac{73}{16} = \frac{87}{16}
(\frac{57}{16} - y) = \frac{87}{16} - \frac{73}{16}
(\frac{57}{16} - y) = \frac{14}{16}
y = \frac{14}{16} + \frac{57}{16}
y = \frac{71}{16}
y = 4,4375
3) \frac{367}{27} + (x-\frac{71}{27}) = \frac{815}{27}
(x-\frac{71}{27}) = \frac{815}{27} - \frac{367}{27}
(x-\frac{71}{27}) = \frac{448}{27}
x = \frac{448}{27} + \frac{71}{27}
x = \frac{519}{27}
4) (y - \frac{54}{25}) + \frac{107}{25} = \frac{356}{25}
(y - \frac{54}{25}) = \frac{356}{25} - \frac{107}{25}
(y-\frac{54}{25}) = \frac{249}{25}
y = \frac{249}{25} + \frac{54}{25}
y = \frac{303}{25}
y = 12,12
Пошаговое объяснение: