Question

решите плиз с решением.СРОЧНО!!!

c183ec5dd39fa08515fd94b670a0539a.docx

Answer 1

#1.

$frac{x-14}{x - 8} = frac{7}{10} \\10 * (x-14) = 7 * (x-8)\10x - 140 = 7x - 56\10 x - 7x = 140 - 56\3x = 84\x = 28$

#2.

$6 + frac{x}{2} = frac{x+3}{5} \\frac{12 +x}{2} = frac{x+3}{5} \\5 * (12+x) = 2 * (x+3)\60 + 5x = 2x + 6\5x - 2x = 6 - 60\3x = -54\x = -18$

#3.

$frac{x+7}{3} + frac{x}{3} = 8\\frac{x+7 + x}{3} = 8\\frac{2x+7}{3} = frac{8}{1} \\2x+7 = 8*3\2x = 24 - 7\x = 17 : 2 = 8,5$

#4.

$frac{3x-2}{4} - frac{x}{3} = 2\\frac{3(3x-2) - 4*x}{4 * 3} = 2\\frac{9x - 6 - 4x}{12} = frac{2}{1} \\5x - 6 = 2 * 12\5x = 24 + 6\ 5x = 30\x=6$

#5.

$frac{1}{x+2} = -frac{1}{2} \\1 * 2 = -1 * (x+2)\2 = -x - 2\ x = -4$

#6.

$x - frac{6}{x} = -5\\frac{x+5}{1} = frac{6}{x} \\x(x+5) = 6\x^2 + 5x - 6 = 0$

По теореме Виета:

$left[begin{array}{ccc}x_1 = -6\x_2 = 1end{array}right$

Ответ: -6.

#7.

$frac{x}{6} + frac{x}{5} + x = -frac{41}{6} \\frac{5x +6x + 30x}{30} = -frac{41}{6} \\frac{41x}{30} = -frac{41}{6} \\41x * 6 = 30 * (-41)|:41*6\ x = 5 * (-1) = -5$

#8.

$1 + frac{x}{7} = x + 7\\frac{7+x}{7} = frac{x+7}{1} \\7+x = 7*(x+7)\ 7+x=7x + 49\7x - x= 7 - 49\6x = -42\x = -7$

#9.

$2x - 3 = frac{x+3}{5} \\5* (2x-3) = x + 3\ 10x - 15 = x + 3\ 10x - x = 15 + 3\ 9x = 18\ x = 2$

#10.

$frac{x-8}{x - 12} = 5\x-8 = 5 * (x-12)\ x - 8 = 5x - 60\ 5x - x = 60 - 8\ 4x = 52\ x = 13$

Answer 2

Спасибо большое,помоги еще одно решить пж там 20б даю