(abc) 4 −2 bc 2 1 3 27 3 × 16 2 = ⋯ 3 2 ( 2 ) × ( ) 2 −3 3 5 2 4 .4 .4 −3 = ⋯ 3 4 . 4 4 (5 ×10 −6 ) × 1.000.000 = ⋯ (100) −2 √ = √ = √ √ √ √ = √ 10