19*33+659-12-65等于多少
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19*33+659-12-65等于多少
19*33+659-12-65等于多少
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
19*33+659-12-65=627+659-12-65=1286-12-65=1274-65=1209.先乘除后加减
19*33+659-12-65
=(20-1)*33+659-77
=(20*33-33)+(660-1)-77
=660+660-33-1-77
=1320-101
=1209
19*33+659-12-65
=627+659-12-65
=1286-77
=1209