1) 53 × 47 = (50 + 3)(50 - 3) = 50^2 - 3^2 = 2500 - 9 = 2491
2) 29,8 × 30,2 = (30 - 0,2)(30 + 0,2) = 30^2 - (0,2)^2 = 900 - 0,04 = 899,96
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Answers & Comments
1) 53 × 47 = (50 + 3)(50 - 3) = 50^2 - 3^2 = 2500 - 9 = 2491
2) 29,8 × 30,2 = (30 - 0,2)(30 + 0,2) = 30^2 - (0,2)^2 = 900 - 0,04 = 899,96