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b)√81-√36=9-6=3
c)4·√16=4·4=16
d)-5·√121=-5·11=-55
e)24:√9=24:3=8
f)√64:√16=8:4=2
g)-√144+√64=-12+8=-4
h)-√324-√100=-18-10=-28
i)-√256·(-√25)=-16·(-5)=80
j)-√81:(-√9)=-9:(-3)=3