展开 A(0,4)B(3,-2)

解答

展开

A (0, 4) B (3, - 2)

3 (0 \cdot 4,) A B, - 2 (0 \cdot 4,) A B

求解步骤

A (0, 4) B (3, - 2)

= (0 \cdot 4,) (3, - 2) A B

使用分配律:

a (b - c) = ab - a c

a = A (0, 4) B, b = 3,, c = 2

= A (0, 4) B \cdot 3, - A (0, 4) B \cdot 2

= 3 (0 \cdot 4,) A B, - 2 (0 \cdot 4,) A B

e x p an d \frac{7 + 4 x}{4 ( x - 2 )}

s im pl i f y (3 x - 2) (x^{3} + 2)

e x p an d (3 x^{2} y^{2} + 2) d x + (2 x^{3} y - 3) d y

e x p an d - 2 l e f t (x + 3)^{2}

s im pl i f y 3 x^{2} (1 + x) + \frac{x ^{\frac{5}{2}}}{2}