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(√4 * 1/4) / (1-1/2)=(2*1/4) *2=1/2*2=1
b]=
√[ 6+√(7+2)]=√[6+√9]=√[6+3]=√9=3
c]=
[ 2∛(9/5) +∛(-25/3) ] *∛(-0,12)=2∛[ 9/5*(-3/25)] +∛[ -25/3*(-3/25)]=
2∛(-27/125) +∛1=-6/5+1=-1/5
d]=
[18-18√2+9)(18+18√2+9)=(27-18√2)(27+18√2)=729-648=81
e]=
(81+18√11+11)-(81-18√11+11)=92+18√11-92+18√11=36√11
f]=
8-√5+2√ [ (8-√15)(8+√15)] +8+√15=16+2√[64-15]=16+2√49=16+14=30
g]=
2+√3-2√[ (2+√3)(2-√3)]+2-√3=4-2√[4-3]=4-2=2