Question

Решите все уравнения! ! взарание 1) 2/3(10-х) =-12 2)0,2(х+3)=6 3) 1,25(х-4)=-3,75(х+4) 4) 3х/0,2=х+5/0,1 5) х\2=3/5

Answer 1

1) 2/3(10-х) =-12
10 - x = -12*3/2
10 - x = -18
x = 10 + 18 = 28
2) 0,2(х+3)=6
x + 3 = 6/0.2
x + 3 = 30
x = 27
3) 1,25(х-4)=-3,75(х+4)
x - 4 = -3(x + 4)
x - 4 = -3x - 12
4x = -12 + 4
4x = -8
x = -2
4) 3х/0,2=х+5/0,1
15x = x + 50
14x = 50
x = 50/14
x = 4 4/14 = 4 1/7
5) х\2=3/5
x = 3/5 * 2
x = 6/5 = 1.2

Answer 2

$1) \frac{2}{3} (10-x)=-12 \\ 10-x=- \frac{12*3}{2} \\ 10-x=-6*3 \\ 10-x=-18 \\ x=28 \\ \\ 2)0.2(x+3)=6 \\ x+3=30 \\ x=27 \\ \\ 3)1.25(x-4)=-3.75(x+4)\\1.25x-5=-3.75x-15 \\ 1.25x+3.75x=-15+5 \\$
$5x=-10\\x=-2$
$4) \frac{3x}{0.2} = \frac{x+5}{0.1} \\ 0.3x=0.2x+1 \\ 0.3x-0.2x=1 \\ 0.1x=1 \\ x=10 \\ \\ 5) \frac{x}{2} = \frac{3}{5} \\ 5x=6 \\ x=1.2$