展开 (x-y=3,)-(x+2y=6)

解答

展开

(x - y = 3,) - (x + 2 y = 6)

(x - y = 3,) - x - 2 y = 6

求解步骤

(x - y = 3,) - (x + 2 y = 6)

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

- (x + 2 y = 6) : - x - 2 y = 6

(x - y = 3,) - x - 2 y = 6

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