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√5 = √5
√2.√2.√2.√5÷√5
√2.√2.√2
2√2
∵ 2√10 ÷ √5 = 2√10 / √5 × √5 / √5
= 2√50 / 5
= 10√2 / 5
= 2√2
ket : /(garis miring) = per