420+361=?,236+495=?,920+728=?
765-29=?,923-607=?,1365-731=?
48+?=883,270+?=713,1242+?=1692
77*7=?,9*74=?,867*5=?
654/3=?,224/8=?,786/6=?
---
?-286=851-483,172+195+479+375=?
777-256=?+362,513+588+333-1289=?
270+?+341=941,1025+505-798-663=?
242+?-571=440,1978-659-568-495=?
洗净癞皮狗