Реши уравнения. а)f+4/5=4/7+3/7 б)459-z=725-275 в)t:5=250*3

Найдем корешки.

а) f + 4/5 = 4/7 + 3/7; 

f + 4/5 = (4 + 3)/7;

f + 4/5 = 7/7;

f + 4/5 = 1;

f = 1 - 4/5;

f = (5 * 1 - 4 * 1)/5;

f = 1/5;

f = 0.2.

б) 459 - z = 725 - 275; 

459 - z = 500 - 50;

459 - z = 450;

z = 459 - 450;

z = 9.

в) t/5 = 250 * 3; 

t = 250 * 3 * 5; 

t = 750 * 5; 

t = 3 750.