计算0r'x6U1O:`8n1a,d
3×999+3+99×8+8+2×9+2+90r'x6U1O:`8n1a,d
算式：提示-l9l3U*[+g0r'x6U1O:`8n1a,d
=*H0J2y,s(a)q,x9W0r'x6U1O:`8n1a,d