Ответы и объяснения

2013-05-07T00:11:36+04:00

2,1/y=(2 4//5)/(3 1//5)
2.1/y-2.8/3.2=0

2.1/y-0.875=0
y=2.1/0.875
y=2.4

-3(2,1x-4)-4,2=1,2*(-5x+0,5)
-6.3x+12-4.2-1.2*(-5x+0.5)=0

-6.3x+7.8-1.2*(-5x+0.5)=0

-6.3x+7.8+6x-0.6=0

-0.3x+7.8-0.6=0

-0.3x+7.2=0

x=7.2/0.3
x=24