a)x+2/5=-4/3

x=-4/3-2/5

x=-26/15

b)-5/6+1/3.x=(-1/2)²

-5/6+1/3.x=1/4

1/3.x=1/4+5/6

1/3.x=13/12

x=13/12:1/3

x=13/4

c)7/12-(x+7/6).6/5=(-1/3)³

7/12-(x+7/6).6/5=-1/8

(x+7/6).6/5=7/12-(-1/8)

(x+7/6).6/5=17/24

x+7/6=85/144

x=85/144-7/6

x=-83/144

a)4/9+1/4=16/36+9/36=25/36

b)1/3.(-4/5)+1/3.-1/5+2023⁰

=1/3.(-4/5+-1/5)+1

=-1/3+1=2/3

c)1/5-(1/4-(1-1/2)²)

=1/5-(1/4-(1/2)²)

=1/5-(1/4-1/4)

=1/5-0=1/5

544448/468484+464684

95959

559595fssdzss

+1

5+

3+63+6

2767+724

56344978573

14698

98