упростите выражение 1/2(2а-9)-1/2(5в+4) и найлдите его значение при а=4 1/2 и в=4/15. Created by vovadusenok. algebra-ru

Ответ:(2a-9)-(5b+4) = * (2a-9(5b+4)) = * (2a-45b-36) = a - 22,5b - 18 = a - b - 18 если a = 4, b = , то4 - b * - 18 = 4 - 6b - 18 = -13 - 6b

15...

khlystunyaroslava

Ответ:

$\frac{1}{2}$ (2a-9)- $\frac{1}{2}$ (5b+4) = $\frac{1}{2}$ * (2a-9(5b+4)) = $\frac{1}{2}$ * (2a-45b-36) = a - 22,5b - 18 = a - $\frac{225}{10}$ b - 18

если a = 4 $\frac{1}{2}$ , b = $\frac{4}{15}$ , то

4 $\frac{1}{2}$ - $\frac{225}{10}$ b * $\frac{4}{15}$ - 18 = 4 $\frac{1}{2}$ - 6b - 18 = -13 $\frac{1}{2}$ - 6b

1 votes Thanks 1

OblivionFire

$\frac{1}{2} (2a - 9) - \frac{1}{2} (5b + 4) = \frac{1}{2} \times 2a - \frac{1}{2} \times 9 - \frac{1}{2} \times 5b - \frac{1}{2} \times 4 = a - \frac{9}{2} - \frac{5}{2} b - 2 = a - \frac{13}{2} - \frac{5}{2} b \\$

$a = 4 \frac{1}{2} = \frac{9}{2} \\ b = \frac{4}{15} \\ \frac{9}{2} - \frac{13}{2} - \frac{5}{2} \times \frac{4}{15} = \frac{9}{2} - \frac{13}{2} - \frac{2}{3} = \frac{ - 4}{2} - \frac{2}{3} = - 2 - \frac{2}{3} = - \frac{6 + 2}{3} = \bf - \frac{8}{3} = - 2 \frac{2}{3}$

3 votes Thanks 2

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