Answer :

(1.8)6 × (4.2)-3 = (18×10-1)6×(42×10-1)-3

(1.8)6 × (4.2)-3 = (32×2×10-1)6×(7×3×2×10-1)-3


(1.8)6 × (4.2)-3 = 312×26×10-6×7-3×3-3×2-3×103


(1.8)6 × (4.2)-3 = 39×23×7-3×10-3




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