展开-1.5(5x+2y=-9)

解答

展开

- 1.5 (5 x + 2 y = - 9)

- 7.5 x - 3 y = 13.5

求解步骤

- 1.5 (5 x + 2 y = - 9)

= - 1.5 (5 x + 2 = y - 9)

打开括号

(- 1.5) \cdot 5 x + (- 1.5) \cdot 2 y = (- 1.5) (- 9)

使用加减运算法则

+ (- a) = - a, (- a) (- b) = ab

- 5 \cdot 1.5 x - 2 \cdot 1.5 y = 9 \cdot 1.5

化简

- 5 \cdot 1.5 x - 2 \cdot 1.5 y = 9 \cdot 1.5 : - 7.5 x - 3 y = 13.5

- 7.5 x - 3 y = 13.5

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