Решите уравнения а)3,6: 4,2=6: х б)15: 10=x: 40 в)3: x=3/8: 1/4 г)x: 1 1/3 =6: 4 д)x: 3.86=2.5: 2 1/2

А)
3,6:4,2=6:Х;
36/10*10/42=6/Х;
36/42=6/х;
36/42=36/6х;
х=42/6=7.

б)15:10=X:40;
1,5=х/40;
х=40*1,5=60;

в)3:X=3/8:1/4;
3/х=3/8*4/1;
3/х=3/2;
х=2;

г)X:1 1/3 =6:4;
х/(4/3)=6/4;
х*3/4=6/4;
х*3=6;
х=2.

д)X:3.86=2.5:2 1/2;
х/386/100=25/5/2;
100х/386=50/5=10;
100х=3860;
х=38,6.