用简便方法计算:1p'G)f/`1B0}4k6d8C-q/t2y+v8F
2.5×0.04×971p'G)f/`1B0}4k6d8C-q/t2y+v8F
算式:提示)h0u0z7g6A;w0o;u.S-r1p'G)f/`1B0}4k6d8C-q/t2y+v8F