А)(-2.25+4 2/3)+(7.6-1 8/9-1 3/4)-7.6
=(-9/4+14/3)+(38/5-8/9-7/4)-38/5=
=29/12+893/180-38/5=
= -2/9
В)(-4/15+1.18-5/7)+1 3/14+(-1.68+2 4/15)=
=(-4/15+59/50-5/7)+17/14+(-42/2534/15)=
=209/1050+17/14+44/75=
=2
А)(-2.25+4 2/3)+(7.6-1 8/9-1 3/4)-7.6
=(-9/4+14/3)+(38/5-8/9-7/4)-38/5=
=29/12+893/180-38/5=
= -2/9
В)(-4/15+1.18-5/7)+1 3/14+(-1.68+2 4/15)=
=(-4/15+59/50-5/7)+17/14+(-42/2534/15)=
=209/1050+17/14+44/75=
=2