Question

Решить, буду благодарна :
1) х+ 2 целых 17/20= 3 целых 1/2
2)-5 целых 1/3 * х= 56/69
3)х- 6 целых 3/20= -39/40
4)х : (-1 целая 1/2)= 13/20
5)5/8у-3/4=2у-2 целых 2/5

Answer 1

1)x+2(17/20)=3(1/2)
x+(57/20)=(7/2)
x=(7/2)-(57/20)
x=(140/40)-(114/40)
x=26/40
x=13/20
x=0,65

2)-5(1/3)*x=56/69
-(16/3)*x=56/69
x=-((56*3)/(69*16))
x=-(56/(23*16))
x=-(14/(23*4))
x=-(14/92)
x=-(7/46)

3)x / -(1(1/2)) = 13/20
-2x/3=13/20
-2x=(13*3)/20
x=-39/40


4)(5/8)y - (3/4) = 2y - 2(2/5)
(5/8)y-2y = - (12/5) + (3/4)
(5/8)y-(16/8)y = - (48/20) + (15/20)
-(11/8)y = - (33/20)
y = (33*8)/(20*11)
y = (3*4)/10
y = 12/10
y = 1,2