11111111)
1)4 2/5*6 1/3=22/5*19/3=418/15
2)2 1/3*4,4=7/3*44/10=308/30=154/15
3)418/15-154/15=264/15
4)264/15*5/22=12/3=4
5)1,8:4=0,45
====================
2222222)
1)1/6-1 1/5=1/6-6/5=(5-36)/30=-31/30
2)-31/30+1/10=(-31+3)/30=-27/30
3)-27/30:0,6=-27/30*10/6=-9/6=-1,5
4)-1,5+0,4=-1,1
=======================
3333333)
1)0,15*6,4=0,96
2)0,15-0,96=-0,81
3)0,175-3/8=0,175-0,375=-0,2
4)-0,81:(-0,2)=4,05
======================
4444444)
1)1,75:2/3=175/100*3/2=21/8
2)1 3/4*1 1/8=7/4*9/8=63/32
3)21/8-63/32=(84-63)/32=21/32
4)21/32:7/12=21/32*12/7=18/16=1 1/8