Question

Calculati:
a)(-1supra2)-(-1supra3)+[(-1supra6)+(+1supra12)]=.............................................
b)(-5supra12)-[(-1supra2)+(-3supra4)-(-1supra6)]=............................................
c)(-7supra36)+[(-2supra9)+(-5supra18)-(+1supra2)]=........................................
d)(-8supra9)-[-5supra72-(-1supra12)+(-11supra36)]=................................................


Nr. intregi clasa 7
Va rog,repede!

Answer 1

a)(-1/2)-(-1/3)+[(-1/6+(+1/12)]= -1/2 +1/3+ (-1/6+1/12)= -6/12+4/12+(-2/12+1/12)= -2/12 - 1/12= -3/12= -1/4

b)(-5/12)-[(-1/2)+(-3/4)-(-1/6)]= -5/12 - (-1/2-3/4+1/6)= -5/12- (-6/12-9/12+ 2/12)= -5/12 +13/12= 8/12=2/3


c)(-7/36)+[(-2/9)+(-5/18)-(+1/2)]= (-7/36)+[(-4/18)+(-5/18)-(+9/18)]=
= -7/36 +( -4/18 -5/18 - 9/18)= -7/36 - 18/18 = -7/36 - 1 =-7/36- 36/36=
= -43/36

d)(-8/9)-[-5/72-(-1/12)+(-11/36)]=..... -8/9 -(-5/72 +1/12 -11/36)=
= -64/72- (-5/72+6/72-22/72)= -64/72 +21/72= -43/72