Вариант 1
1. a) 1 :0.8 =1 : 8/10 =1 *10/8 =10/8 =5/4 =1.25
b) 1.48 :0.4 =148/100 : 4/10 =148/100 * 10/4 =148*10 /100*4 =37/10 =3.7
v) 158.73 :3.7 =15873/100 : 37/10 =15873*10 /100*37 =429/10 =42.9
2. 6.2x -1.8x =22.42 -4.6
4.4x =17.82
x =17.82 : 4.4
x =1782/100 : 44/10
x =1782*10 /100*44
x =40.5 /10
x =4.05
3. a) 6.56 -3.36 : (0.736+2.464) -20.0424 =6.56 -3.36 :3.2 -20.0424 =6.56 -1.05 -20.0424 = -14.5324