Помогите решить уравнение 9 класс. Created by Aleksander1337. algebra-ru

Ответ:D = ( -7 )² - 4 * 2 * ( -15 ) = 49 + 120 = 169 ~•~•~•ZLOY_TIGROVSKIY~•~•~•

Помогите решить уравнение 9 класс...

Ответ:

$1)2x { }^{2} - 7x - 15 = 0 \\ \\$

D = ( -7 )² - 4 * 2 * ( -15 ) = 49 + 120 = 169

$x1 = \frac{7 - 13}{2 \times 2} \\ \\ x2 = \frac{7 + 13}{2 \times 2} \\ \\ x1 = - \frac{6}{4} = - 1.5 \\ \\ x2 = 5$

$\frac{5x - 2}{3} = \frac{3 - 10x}{9} + 2 \\ \\ 3 \times (5x - 2) = 3 - 10x + 18 \\ \\ 15x - 6 = 21 - 10x \\ \\ 15x + 10x = 21 + 6 \\ \\ 25x = 27 \\ \\ x = \frac{27}{25} = 1.08$

~•~•~•ZLOY_TIGROVSKIY~•~•~•

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banushh200

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Answers & Comments

D = ( -7 )² - 4 * 2 * ( -15 ) = 49 + 120 = 169

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1) 5(x-4)=x+8 2) 9-7(x+3)=5-6x 3)(7x+9)-(11x-7)=8 4)3,6+5y=7(1,2-4) 5)0,4(6-4t...

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