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√[(2√7+√3)(2√7-√3)]=√[28-9]=√19
i]=
63²*[(1/3)²]²=63²*(1/9)²=7²=49
j]=
∛[(-2)^-3*(2^4)^3/4]=∛[-2^-3*2³]=∛-2^0=-1
k]=
[5√2-3√2]/√2=2√2/√2=2
l]=
-9-[-2-1/2]²=-9-(-5/2]²=-36/4-25/4=-61/4
]=
[√25/16 +1/3]*12=[5/4+1/3]*12=15+4=19