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2/5-11/10=-7/10
4/3x-7/10=-28/30
La cuarta 4/9-(-2/5+1/2)-3/10=
(-2/5+1/2)=1/10
4/9-1/10-3/10=2/45
La tercera (1/2-10)/(2/3+3/5)=
(1/2-10)=-19/2
(2/3+3/5)=19/15
(-19/2)/(19/15)=-285/38
La quinta es 4^3 x (2^2-2^2)-((1/2+6/5 / (-1/5))^2=
64x(4-4)-(17/10 / (-1/5))^2
64x0=0
(17/10 /(-1/5))^2=(85/-10)^2
(85/-10)^2=7225/100
La segunda es asi (9/2)x(-5/2)x(-4)+(1/2 / 6)-(3/5)x(-10)=
(-45/4)x(-4)+(1/2)-(3/5)x(-10)=
180/4+1/2-(-30/5)=1030/20
Espero que te haya servido de ayuda hasta la próxima.