No Calculator Allowed || 9O% of Students Failed This Tricky Math Test ||

[@franklee663]

just use a^3-b^3=(a-b)(a^2+ab+b^2), 27 and 81 are not big numbers to multiply.

[@RealQinnMalloryu4]

54^{0+^0 ➖}=54^1= 54 3^18 3^3^6 1^1^3^2 3^2 (x ➖ 3x+2).

[@walterwen2975]

Tricky Math Test: 27³ - 81³ = ? 27³ - 81³ = (3³)³ - (3⁴)³ = 3⁹ - 3¹² = 3⁹(1 - 3³) = (- 26)(3⁹) = (- 26)[3(3²)⁴] = (- 78)(9⁴) 9⁴ = [(10 - 1)²]² = (10² - 20 + 1)² = (10² - 19)² =10⁴ - 3800 + (20 - 1)² = 10⁴ - 3800 + (400 - 40 + 1) = 10000 - 3400 - 39 = 6561= 6500 + 61 27³ - 81³ = (- 78)(9⁴) = - (80 - 2)(6500 + 61) = - (80)(6500) - (80)(61) + 2(6561) = - 520000 - 4880 + 13122 = - 511758