Question

№1.Решить уравнения:
1)7:8=х:98;
2)у:1.5/31=7.3/4:1/3;
3)а/0,6=25/3;
4)2+t/5=4/9;

Answer 1

1)7:8=х:98; (7*98)/8=8x; x=343/4; x=85,75
2)у:1.5/31=7.3/4:1/3; y:36/31=31/4:1/3; (31y)/36=(31*3)/4; (31*4y)/124=(36*93)/124; y=27
3)а/0,6=25/3; 5a/3=25/3; 5a=25; a=5
4)2+t/5=4/9;t/5=-2+4/9;t/5=-14/9; 9t/45=-70/45; 9t=-70; y=-7целых 7/9