Question

Como responder [(
3sobre 4 +2sobre5)- (1sobre 2-1sobre 5)-7sobre 10



Me ajudem porfavor
.

Answer 1

 [(3/4 +2/5)- (1/2-1/5)-7/10]

vamos resolver o que está entre parenteses:3/4 +2/5  mmc(5,4)= 20
15+8/20=
23/20

(1/2-1/5)  mmc(2,5)= 10
5-2/10=
3/10

 [(3/4 +2/5)- (1/2-1/5)-7/10]
[23/20 - 3/10 - 7/10]=           mmc(20,10)=20
(23-6-14)/20=
(23-20)/20=
3/20