(540000-120000)+(420000+20000)=
1. 540000-120000=420000
2. 420000+20000=620000
3.420000+620000=1040000
10
1000
0,1
0,0001 ..............
1)
-6 2/3-8,75-2 5/12=-20/3-35/4-29/12=
-80/12-105/12-29/12=-214/12
-214/12= -17 5/6
2)-3 7/15-0,4-6 1/3= -52/15-6/15-19/3=-58/15-95/15=-153/15=-10,2
Умножим правую и левую части на 10,
-9(х-4)-33=12-6х;
-9х+36-33=12-6х;
3-12=9х-6х;
3х=-9;
х=-9/3;
х=-3.