19*33+659-12-65等于多少

问题描述:

19*33+659-12-65等于多少

原式=20*33-33+659-12-65
=660+659-33-65-12
=660+659-(33+12)-65
=660+659-(45+65)
=660+(659-110)
=660+549=1209
或者原式=627+659-12-65
=1286-12-65
=1274-65
=1209