展开 (2x+3y=6,)(4x+6y=12)

解答

展开

(2 x + 3 y = 6,) (4 x + 6 y = 12)

8 x^{2} + 12 x y = 12

求解步骤

(2 x + 3 y = 6,) (4 x + 6 y = 12)

= (2 x + 3 \cdot 6 =, y) (4 x + 6 \cdot 12 = y)

使用 FOIL 方法:

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

a = 2 x, b = 3 y = 6,, c = 4 x, d = 6 y = 12

2 x \cdot 4 x + 2 x \cdot 6 y = 12 + 3 y = 6, 4 x + 3 y = 6, 6 y = 12

2 \cdot 4 xx + 2 \cdot 6 x y = 12 + 3 y = 6, 4 x + 3 y = 6, 6 y = 12

乘开

2 \cdot 4 xx + 2 \cdot 6 x y : 8 x^{2} + 12 x y

8 x^{2} + 12 x y = 12

e x p an d (2 x y + z^{2}) (3 cos (t))

e x p an d (\frac{7}{x ^{3}} + 5 x^{5})^{5}

s im pl i f y (x) \cdot (x - 4)

s im pl i f y 100.53 (t - sin (t))

e x p an d [s \cdot y - d \cdot k, y - d \cdot k] + d i v i d e [k, y - d \cdot k] (1 - s) d - s