Răspuns :
a = ( 7√2/2√5 + 4/√10 ) × √10^-1
a = ( 7√10/10 + 2√10/5 ) × √ 10^-1
a = 11√10/10 × √1/10
a = 11√10/10 × 1/√10
a = 11/10
√11/10 = √11/√10 = √110/10 = 1,04
a = ( 7√10/10 + 2√10/5 ) × √ 10^-1
a = 11√10/10 × √1/10
a = 11√10/10 × 1/√10
a = 11/10
√11/10 = √11/√10 = √110/10 = 1,04