Вычислите:1)3/5-4/5; 2)2/7-(3/7); 3)-1/2-1/4; 4)-2/9-(-1/3); 5)-4,8-5.9; 6)7-9,13

Question

Вычислите:
1)3/5-4/5; 2)2/7-(3/7); 3)-1/2-1/4; 4)-2/9-(-1/3); 5)-4,8-5.9; 6)7-9,13

Answer 1

1) 3/5-4/5=-(4/5-3/5)=-1/5
2) 2/7-(3/7)=2/7-3/7=-(3/7-2/7)=-1/7
3) -1/2-1/4=-2/4-1/4=-(2/4+1/4)=-3/4
4) -2/9-(-1/3)=-2/9+1/3=-2/9+3/9=3/9-2/9=1/9
5) -4,8-5,9=-(4,8+5,9)= - 10,7
6) 7-9,13= - (9,13-7)= - 2,13