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3/7 - (25/10 x 7/25 - 2/10) =
3/7 - (7/10 - 2/10)=
3/7- 5/10=
30/70 - 35/70= - 5/70= -1/14
b) 2+(2+(2+(2+2))-2)-2=
2+(2+(2+4)-2)-2=
2+(2+6-2)-2=
2+6-2= 6
c) 0,12 x 3/4 - (3/5 - 2,1 x 5/7)=
12/100 x 3/4 - (3/5 - 21/10 x 5/7)=
9/100 - (3/5 - 3/2)=
9/100- (6/10- 15/10)=
9/100- (-9/10)=
9/100+ 90/100= 99/100
d) ((3,2 + 7/8) :2,5 - 0,62) x (-100/3)=
((32/10+7/8): 1,88) x (-100/3)=
((256/80+70/80) x 100/188) x (-100/3)=
(326/80 x 100/188) x (-100/3)=
przepraszam ze tylko tyle ale nie mam na wiecej czasu, moze przynajmniej sie to przyda ;]