题目

— Whose bike is that?— I think it's . A . Mingming's B . Mingmings C . Mingming D . Mingmings’ 答案：A17．计算：（1）$\frac{5c}{6{a}^{2}b}$+$\frac{7a}{8{b}^{2}c}$-$\frac{b}{12{a}^{2}c}$；（2）$\frac{3}{x+2}$+$\frac{1}{2-x}$+$\frac{2x}{{x}^{2}-4}$．