Calcule e simplifique se possivel 3/4+(-1/2)+(-2/5)

3/2+4/8= 3*4/2*4 +4/8= 12+4/8 =16/8 =16÷8/8÷8= 2

13/18-5/18= 13-5/18= 8/18= 8÷2/18÷2= 4/9

4/6-3/5 = 4*5/6*5 - 3*6/5*6= 20-18/30= 2/30 =2÷2/30÷2= 1/15

2/5*3/4= 2*3/5*4= 6/20= 6÷2/20÷2= 3/10

2*8/9= 16/9

3/4*9/7= 3*9/4*7= 27/28

2/7:5/8= 2/7*8/5 (na divisão vc inverte a segunda fração) = 2*8/7*5 = 16/35

6/10:5/9= 6/10*9/5 = 6*9/10*5 = 54/50= 54÷2/50÷2= 27/25

3/5 de 25:

25 / 5 denominador = 5
5 * 3 numerador = 15
Resposta= 15

3/5=

25/5=5
5*3=15
Resposta = 15

divida pelo denominador
multiplique pelo numerador

A) 3/2 + 1/2 =4/2 = 2/1 b) 13/18 - 5/ 18 = 8/18 = 4/9 c) 4/6-3/2=2/3-3/5=10-9/15=1/15 d). 2/5*3/4=6/20=3/10 e). 2*8/9=16/9 f) 3/4*9/7=27/28 g). 2/7:5/8=16/35 h). 6/10:5/9=54/50