展开 (A+B=2,)(-2A+C=3)

解答

展开

(A + B = 2,) (- 2 A + C = 3)

- 2 A^{2} + A C = 3

求解步骤

(A + B = 2,) (- 2 A + C = 3)

= (A + 2 =, B) (- 2 A + 3 = C)

使用 FOIL 方法:

(a + b) (c + d) = a c + a d + b c + b d

a = A, b = B = 2,, c = - 2 A, d = C = 3

A (- 2 A) + A C = 3 + B = 2, (- 2 A) + B = 2, C = 3

使用加减运算法则

+ (- a) = - a

- 2 AA + A C = 3 - B = 2, 2 A + B = 2, C = 3

乘开

- 2 AA + A C : - 2 A^{2} + A C

- 2 A^{2} + A C = 3

e x p an d \frac{5 ( 3 b ^{2} + 4 b - 6 )}{4}

s im pl i f y (x - x - 1)^{2}

s im pl i f y (x - 13)^{2}

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

e x p an d (- x sin^{2} (y) - x cos^{2} (y))^{2}