展开 (5-2sqrt(2))(sqrt(5)+2)

解答

展开

(5 - 22) (5 + 2)

55 + 10 - 210 - 42

十进制

9.19893 \dots

求解步骤

(5 - 22) (5 + 2)

Apply FOIL method

(5 - 22) (5 + 2) : 55 + 10 - 210 - 42

= 55 + 10 - 210 - 42

e x p an d 800 (2 x + 7 y = 121)

e x p an d \frac{( x - 2 ) ^{2}}{2}

e x p an d \frac{8}{( ( x ^{2} + 2 ) ( x ^{2} - 6 ) )}

e x p an d (x^{2} - 1) (4 + x + 15)

e x p an d \frac{\frac{d}{d x} ( \frac{1}{x + 1} ) - 1}{in ( 2 + x )}