展开 (3,-4)x(3,9)

解答

展开

(3, - 4) x (3, 9)

3 (3 \cdot 9,) x, - 4 (3 \cdot 9,) x

求解步骤

(3, - 4) x (3, 9)

= (3, - 4) (3 \cdot 9,) x

使用分配律:

a (b - c) = ab - a c

a = x (3, 9), b = 3,, c = 4

= x (3, 9) \cdot 3, - x (3, 9) \cdot 4

= 3 (3 \cdot 9,) x, - 4 (3 \cdot 9,) x

e x p an d \frac{3 ( 144 + 9 6 )}{125}

e x p an d (x + 1) d y - [3 y]

e x p an d \frac{5 ( 3 + 2 x )}{2 ( 5 - 4 x )}

e x p an d \frac{x - 3 ( 2 y - z )}{2 x y}

e x p an d 3 (2 z - 10 = - 12)