Question

Вычислите: 3/5 -4/5; 2/7-(-3/7);
-1/2-1/4; -2/9-(-1/3); -4,8-5,9; 7-9,13
найдите значения вырожения :
(3,5-2,9)-(3,7-9,1)
(2/5-2/3)-(2/7-3/5)

Answer 1

3/5-4/5=-1/5;
2/7-(-3/7)=5/7;
1/2-1/4=1/4;
-2/9-(-1/3)=-1/9;
-4.8-5.9=-10.7;
7-9.13=-2.13


(3.5-2.9)-(3.7-9.1)=0.6-(-5.4)=0.6+5.4=6
(2/5-2/3)-(2/7-3/5)=(6/15-10/15)-(10/35-21/35)=
=-4/15+11/35=15/525=1/35