Решите уравнения 1) - 0.5 х+13.8=12.4 2) х: (-3) - 20.1=-21.9 3) 2.5:х+2.812=-7.188 4) - 91.2 + (-2 х) = - 100.7

-0,5*х+13,8=12,4

-0,5*х=12,4-13,8

-0,5*х=-1,4

х=-1,4 * (-0,5)

х=-2,8

х: (-3) - 20,1=-21,9

х: (-3) = - 21,9 + 20,1

х: (-3) = - 1,8

х=-1,8 * (-3)

х=5,4

2,5:х+2,812=-7,188

2,5:х=-7,188-2,812

2,5:х=10

х=10:2,5

х=4

-91,2 + (-2*х) = - 100,7

-2*х=-100,7+91,2

-2*х=-9,5

х=-9,5: (-2)

х=4,75

х=9,5

х=4

1) - 0.5x=12.4-13.8

-0.5x=-1.4

x=-1.4/-0.5=1.4/0.5=14/5=2.8

2) x / (-3) = - 21.9 - (-20.1)

x / (-3) = - 1.8

x=-1.8 / (-3) = 1.8/3=0.6

3) 2.5/x=-7.188-2.812

2.5/x=-10

x=-10/2.5=-100/25=-4

4) - 2x=-100.7+91.2

-2x=-9.5

x=-9.5 / (-2) = 9.5/2=4.75