展开 2(r-3/4-8=50)

解答

展开

2 (r - \frac{3}{4} - 8 = 50)

2 r - \frac{35}{2} = 50

求解步骤

2 (r - \frac{3}{4} - 8 = 50)

= 2 (r - \frac{3}{4} - 8 \cdot 50 =)

打开括号

= 2 r + 2 (- \frac{3}{4}) + 2 (- 8 = 50)

使用加减运算法则

+ (- a) = - a

2 r - 2 \cdot \frac{3}{4} - 2 \cdot 8 = 50

乘开

2 r - 2 \cdot \frac{3}{4} - 2 \cdot 8 : 2 r - \frac{35}{2}

2 r - \frac{35}{2} = 50

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