Question

com o auxilio da simplificação se preciso for calcule as expressões


a) [(1/3-3/5) : 21/10 +8/21•27/5]

b) 5+[6•(4/2+125/9-14/9):1]

c) [3/4•(2-3/4)]:[3/5•(4+1/2)]

Answer 1

a) [ ( 1/3 - 3 /5 ) : 21/10 + 8/21  . 27/5]
5/15 - 9/15) : 21/10 +72/35
-4/15 : 21/10 + 72/35
-4/15 .10/21 + 72/35
8/63 + 72/35=
m.m.c =315
40/315 + 648/315=688/315
b)5 + [6 (4/2 + 125 /9 - 14/9 ) : 1 
5 + [ 6 . (4/2 + 111/9) : 1
5 + [ 6 . (36/18 + 222/18] : 1
5 + [ 6 . 258/18]:1
5 + 86 : 1
5 + 86 = 91
c) [3/4 . (2 - 3/4 )] : [ 3/5 . ( 4 + 1/2 )]
[3/4 . (5/4) ]: [3/5 . (9/2)]
[3/4 . 5/4] : [3/5 . 9/4]
15/16 : 27/20
15/16 . 20/27=300/432 simplificando por 12 fica =25/36