√45 - √5 + √20 =
= (√5 * √9) - (√5) + (√5 * √4) =
= √5(√9 - 1 + √4) =
= √5(3 - 1 + 2) =
= √5 * 4
= √5 * √16
= √80
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√45 - √5 + √20 =
= (√5 * √9) - (√5) + (√5 * √4) =
= √5(√9 - 1 + √4) =
= √5(3 - 1 + 2) =
= √5 * 4
= √5 * √16
= √80