一根铁丝长39米,用去7米,还剩多少米?*k1A/h*Q3e-f
算式:提示5A+c'^-a*k1A/h*Q3e-f
答:还剩*S8P5?0e)R;I(R/_'b-P/e9E5{)s米。*k1A/h*Q3e-f