1)
1)3/17-1 5/34=3/17-39/34=6/34-39/34=-33/34
2)-33/34+2/7=(-231+68)/238=-163/238
=========================
2)
1)18/33*55/21=30/21
2)30/21:1 3/7=30/21*7/10=3/3=1
=================================
a)
-2(x+2)-(x-4)=-2x-4-x+4=-3x
==========================
б)
4(x-8)-2(x+3)=4x-32-2x-6=2x-38
===============================