1) 7/3+[(3/2 +4/9 x 9/4) : 1/9 + 11/4] : 1/4=
7/3+[(3x18+4x4+9x9)/36x9/1+11/4]x4=
7/3+[(54+16+81)/4+11/4]x4=
7/3+[151/4+11/4]x4=
7/3+162/4x4=
7/3+126=(7+162x3)/3=(7+486)/3=493/3=164,(3)
2) 1/2 : (1-1/2 ) : [ 1/5 + 4 x ( 1/3 + 1/3 : 2 )] + 1/11 =
1/2:3/2:[1/5+4x(1/3+1/3x1/2)]+1/11=
1/2x2/3:[1/5+4x(1/3+1/6)]+1/11=
1/3:[1/5+4x3/6]+1/11=
1/3:[1/5+2]+1/11=
1/3:11/5+1/11=
1/3x5/11+1/11=1/11(5/3+1)=1/11x8/3=8/33=0,(24)
3) 36 : 24/5 + ( 11/2x 82/11- 9/8x 164/9) : 5/2=
36/1x5/24+(41-41/2)x2/5=
3/1x5/2+(82-41)/2x2/5=
15/2+41/5=(15x5+41x2)/10=(75+82)/10=157/10=15,7
4) 4/19 x { 1/2 + 11/15 : [ 1/60 + 162 x ( 1/270 + 1/405 + 1/360 )]}=
4/19x{1/2+11/15:[1/60+162x(24+16+18)/6480)]}=
4/19x{1/2+11/15:[1/60+162x58/6480]}=
4/19x{1/2+11/15:[1/60+29/20]}=
4/19x{1/2+11/15:[1/60+(29x3)/60]}=
4/19x{1/2+11/15:88/60}=
4/19x{1/2+11/15:22/15}=
4/19x{1/2+11/15x15/22}=
4/19x{1/2+1/2}=4/19x2/1=4/19