Question

АЛГЕБРА ЧЕЕЕЕЕК......../////​

Answer 1

Ответ:

Объяснение:

1)    $\frac{3 +2}{15} * \frac{3}{4} = \frac{5*3}{15*4} = \frac{1}{4}$

2)    $(\frac{3-2}{6} )* 6 = \frac{1}{6} *6 = 1$

3)    (0.2 + 0.4) $*\frac{2}{3} =\frac{6 * 2}{10*3} = \frac{2}{5}$

$-12x -3 = -11x + 3\\-12x+11 = 3+3\\-x = 6\\x = -6$              $0.5x + 3 =0.2x\\0.4x = -3\\x = -3/0.4 \\x = -7.5$           $2x^{2} =8\\x^{2} =8 : 2\\x^{2} =4\\x1 =2; x2=-2$

$\frac{1}{7} x = -1\\x = -1 : \frac{1}{7} \\x=-7$           $\frac{2}{5}x=-1\\x= - 1 : \frac{2}{5} \\x = -\frac{5}{2}= -2.5$             $0.2 + 2.3 = 0.7x - 3.2\\0.2+2.3+3.2 = 0.7x\\0.7x = 5.7\\x = 5.7 : 0.7\\x= \frac{57}{7} = 8\frac{1}{7}$

$-0.4x-11 =0.3\\-11 = 0.3x+0.4x\\-11=0.7x\\x = -11: 0.7\\x= \frac{110}{7}=15\frac{5}{7}$             $\frac{7}{9} x+3=\frac{2}{3} x+5\\\frac{7-6}{9}x = 5 -3\\\frac{1}{9} x = 3\\x = 3 : \frac{1}{9} =27$