计算：1÷2+3÷2+5÷2+7÷2(u6w.`'H(k8e+h'z9E,M+],Z,E
算式：提示9`5Q'z.e7K+t*y4r)o)]8Q8V(u6w.`'H(k8e+h'z9E,M+],Z,E
=5o8h2]:z(u6w.`'H(k8e+h'z9E,M+],Z,E