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2014-11-05T22:38:45+02:00
A)5/3√10=(5·3√10)/3²·√10²=15√10/9·10=15√10/90=√10/6
b)8/(√6+√2)=[8(√6-√2)]/(√6+√2)(√6-√2)=8(√6-√2)/(6-2)=8(√6-√2)/4=2(√6-√2)

a)=(2√7+1+2√7-1)/(2²·7-1)=4√7/27
b)= (√7+√√33+√7-√√33)⁻²=(2√7)⁻²=1/2√7=2√7/2²·7=2√7/28=√7/14

2 5 2