Question

Resolva a expressão: [-3/5+(1/2-1/4)]-[3/10+(-3/4-11/20)

Answer 1

[-3/5+(1/2-1/4)]-[3/10+(-3/4-11/20)]=
[-3/5+(2/4-1/4)]-[3/10+(-15/20-11/20)]=
[-3/5+1/4]-[3/10+(-26/20)]=
[-12/20+5/20]-[6/20-26/20]=
-7/20-[-20/20]=
-7/20+20/20=
13/20

Answer 2

[-3/5+(1/2-1/4)]-[3/10+(-3/4-11/20)]

[-3/5+(2-1)/4)-[3/10+(-15-11)/20)] ==> [-3/5+1/4-[3/10-26/20)]

[(-12+5)/20-[(6-26/20)] ==> - 17 - [-20] 
                                              20     20

- 7 + 20 ==> 13
  20    20       20