1) (-2,9:25+0,26)·(-100)=(-29/10·1/25+26/100)·(-100)=(-29/250+26/100)·(-100)=(-29/250+65/250)·(-100)=36/250·(-100)=-72/5=-14,4
2) (-12-3,7:(-0,4))·(-1,6)=(-12-37/10·(-4/10))·(-16/10)=
=(-12+37/4)·(-16/10)=(-48/4+37/4)·(-16/10)= (-11/4)·(-16/10)=44/10=4,4
3) (-41:0,25+162,8):(-0,06)=(-41/1·100/25+162,8):(-6/100)=
=(-41/1·100/25+162,8)·(-100/6)=(-164+162,8)·(-100/6)=(-1,2)·(-100/6)=
=12/10·100/6=20
4) (-20,5)·(1821-73:0,04)=(-205/10)·(1821/1-73/1:4/100)
=(-205/10)·(1821/1-73/1·100/4)=(-205/10)·1821/1+205/10·73/1·100/4=
=-373305/10+74825/2=-74661/2+74825/2=164/2=82