Question

Найдите неизвестный множитель в верном равенстве:
Номер 646

Answer 1

Пошаговое объяснение:

$\displaystyle 1) - 6 \frac{1}{2} x= 6\\ \\ -\frac{13}{2}x= 6 \\ \\ x= 6 : ( - \frac{13}{2} )\\ \\ x= 6*(- \frac{2}{13}) = - \frac{12}{13}\\ \\ \\ 2) -3,9x= - 13\\ \\ x=-13 : (-3,9)= - 13 : ( - 3 \frac{9}{10}) = -13 : (-\frac{39}{10}) = - 13 * (-\frac{10}{39}) = \frac{10}{3}= 3 \frac{1}{3}$

$\displaystyle 3) -0,01x = - 0,077\\ \\ x= -0,077 : (-0,01)= 7,7\\ \\ 4) -\frac{3}{8}x=0,375 \\ \\ -0,375x = 0,375 \\ \\ x= 0,375 :( -0,375)= -1 \\ \\ 5) x( - 3\frac{5}{17}) = 28 \\ \\ x= 28 : (-3 \frac{5}{17}) = 28 : ( - \frac{56}{17})= 28 *( - \frac{17}{56}) = - \frac{17}{2}= - 8 ,5$

$\displaystyle 6) 3,2x = - 1 \frac{1}{15}\\ \\ x= - 1 \frac{1}{15} : 3 \frac{2}{10}= - \frac{16}{15} : 3 \frac{1}{5}= - \frac{16}{15} : \frac{16}{5}= -\frac{16}{15} * \frac{5}{16}= - \frac{1}{3}$

$\displaystyle 7) 1\frac{7}{8}x= -1 -(\frac{3}{4} )^{2} \\ \\ \frac{15}{8}x= - 1- \frac{9}{16}\\ \\ \frac{15}{8}x= - 1\frac{9}{16}\\ \\ \frac{15}{8}x= - \frac{25}{16}\\ \\ x= - \frac{25}{16} : \frac{15}{8}\\ \\ x=-\frac{25}{16} * \frac{8}{15}= - \frac{5}{2*3}= - \frac{5}{6}$

$\displaystyle 8) 5,6x= -70\\ \\ x= -70 : 5,6 = -12,5$

$\displaystyle 9) -0,1x= -0,23\\ \\ x= -0,23 : (-0,1 ) = 2,3$

$\displaystyle 10) - \frac{3}{5} x= \frac{9}{10}\\ \\ x= \frac{9}{10} : ( -\frac{3}{5}) = \frac{9}{10} * ( - \frac{5}{3}) = - \frac{3}{2}= - 1 \frac{1}{2}$

$\displaystyle 11) \frac{5}{9}x= - 1 \frac{13}{27}\\ \\ \frac{5}{9}x= -\frac{40}{27}\\ \\ x= -\frac{40}{27} : \frac{5}{9}= -\frac{40}{27} * \frac{9}{5}=- \frac{8}{3}=- 2\frac{2}{3}$

$\displaystyle 12) -0,01x= 4,4\\ \\ x=4,4 : (-0,01)= -440$