a) -12/15x(-25/36) simplificam=
-4/5x(-25/36)=simplificam=+5/9
b) -3,14x(-3,700)=
-3,14x(-3,7)=
(-314/100)x(-37/10)=11618/1000=11,618
a)0,45x(-1/45)x100=
45/100x(100/45)=1
b)1/9x(-4/7)+4/7x(1/9)=
1/9x(4/7-4/7)=
1/9x0=0
c)3/5x(5/3+5)=
3/5x5/3+3/5x5=
1+3=4
a. 22/71x10/69=220/4899=0,044....
55/69·4/71=220/4899
22/71x10/69=55/69x4/71
b. -4/71·137/95 <43/123·30/156
-4/71x137/95=-548/6745
43/123x30/156=1290/19188
c. -75/67·65/53 < -74/53·61/68
-75/67x65/53=-4875/3551=-1,37....
-74/53x61/68=-4514/3604=-1,25.....
