展开 2(3x-5y=-5)

解答

展开

2 (3 x - 5 y = - 5)

6 x - 10 y = - 10

求解步骤

2 (3 x - 5 y = - 5)

= 2 (3 x - 5 = y - 5)

打开括号

= 2 \cdot 3 x + 2 (- 5 y =) + 2 (- 5)

使用加减运算法则

+ (- a) = - a

2 \cdot 3 x - 2 \cdot 5 y = - 2 \cdot 5

化简

2 \cdot 3 x - 2 \cdot 5 y = - 2 \cdot 5 : 6 x - 10 y = - 10

6 x - 10 y = - 10

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