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A = 14 x 35 x 10 ² : 21 x 10 ³

A = 490 x 10 ² : 21 x 10 ³

A = 490/21 x 10 ⁻¹

A = 70/3 x 10 ⁻¹

B = 35 x 3 x 10 ² : 21 x 10 ⁻¹

B = 105 x 10 ² : 21 x 10 ⁻¹

B = 105/21 x 10 ³

B = 5 x 10 ³

C = 5 x 12 x 10 ³ : 15 x 8 x 10 ⁻³

C = 60 x 10 ³ : 120 x 10 ⁻³

C = 1/2 x 10 ⁶

D = 3 x 1.2 x 10² x 10 ⁻⁶ : 0.2 x 10 ⁻⁷

D = 3.6 x 10 ⁻⁴ : 0.2 x 10 ⁻⁷

D = 18 x 10 ³

D = 1.8 x 10 ⁴