1)3а+8а=1,87       

 

 

2)7z-3z=5,12

 

3)2t+5t+3,18=25,3

1)3а+8а=1,87 

11а=1,87 а=1,87/11 а=0,17

2)7 z - 3z = 5,12 z * (7 - 3) = 5,12 4z = 5,12 z = 5,12 / 4 

z= 1,28

3)2t + 5t + 3,18 = 25,3 2t + 5t = 25,3 - 3,18 t(2+5) = 22,12 7t = 22,12 t = 22,12 / 7 = 3,16