a)
-\frac{3}{7}-(2.5*\frac{7}{25}-0.2)=-\frac{3}{7}-(2,5*0,28-0,2)-0,2=-\frac{3}{7}-(0,7-0,2)-0,2=
-\frac{3}{7}-0,5-0,2=-\frac{3}{7}-\frac{7}{10}=-\frac{30}{70}-\frac{49}{70}=-\frac{79}{70}=-1\frac{9}{70}
b)
2+(2+(2+(2+2))-2)-2=2+4+2+2-2-2=6
c)
0.12*\frac{3}{4}-(\frac{3}{5}-2.1*5.7)=0,12*0,75-(0,6-11,97)=0,09-(-11,37)=0,09+11,37=11,46
d)
((3.2+\frac{7}{8}):2.5-0.62)*(-\frac{100}{3})=(3,2+0,875):2,5-0,62)*(-\frac{100}{3})=
((4,075:2,5-0,62)*(-\frac{100}{3})=(1,63-0,62)*(-\frac{100}{3})=1,01*(-\frac{100}{3})=
-\frac{101}{10}*\frac{100}{3}=-\frac{1010}{3}=-336\frac{2}{3}
e)
4*(0.6-\frac{3}{5}:(-3))=4*(0,6-0,6:(-3))=4*(0,6-(-\frac{6}{10*3}))=4*(0,6+\frac{2}{10})=4*0,8=2,8