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(-2,25-(-4 7/8) x8=
(-2 1/4-(-4 7/8)x 8=
(-2 2/8 +4 7/8)x8=
2 5/8 x8=
21/8 x8=
21
zad.8
(4,2x3 1/3x(-6))+(-2,75:1 5/6)=
4 1/5x 3 1/3x(-6))+(-2 3/4 : 1 5/6)=
(21/5 x 10/3 x (-6)) + (-11/4 x 6/11)=
14x(-6) + (-1 1/2)=
-84+(-1 1/2)=
-54-1 1/2=
-85 1/2
zad.3
a= (3 2/5-5,4)x(3 1/4+2,75)=
a=(3,4-5,4)x(3,25+2,75)=
a=(-2)x6=
a=-12
b=(2 2/9-4 1/3):3 1/6
b=(2 2/9-4 3/9): 3 1/6
b=(-2 1/9):3 1/6
b= -19/9 : 19/6
b=-19/9x 6/19
b= - 2/3
[-2¼-(-4⁷/₈)]×8= (-2²/₈+4⁷/₈)×8=2⁵/₈×8=²¹/₈×8=21