计算;F/T5G4z.~7j(L9v-@0G6{4Y/G5l3B
657－（269＋357）＋169;F/T5G4z.~7j(L9v-@0G6{4Y/G5l3B
算式：提示9I'Q,u-{5K/U;F/T5G4z.~7j(L9v-@0G6{4Y/G5l3B
＝7s8h3r8e/B:w:S'_5k'g6F)s+i;F/T5G4z.~7j(L9v-@0G6{4Y/G5l3B