展开 (x=2,y+15)(2x+3y=2)

解答

展开

(x = 2, y + 15) (2 x + 3 y = 2)

x = 2, 2 x y + x = 2, 3 yy = 2 + 15 \cdot 2 x + 15 \cdot 3 y = 2

求解步骤

(x = 2, y + 15) (2 x + 3 y = 2)

= (2 =, x y + 15) (2 x + 3 \cdot 2 = y)

使用 FOIL 方法:

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

a = x = 2, y, b = 15, c = 2 x, d = 3 y = 2

x = 2, y \cdot 2 x + x = 2, y \cdot 3 y = 2 + 15 \cdot 2 x + 15 \cdot 3 y = 2

x = 2, 2 x y + x = 2, 3 yy = 2 + 15 \cdot 2 x + 15 \cdot 3 y = 2

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