计算题(整式)
(X+3).(X+4)=
(Y-1).(Y-2)=
(Y+2).(Y-2)=
(2A-1).(3A-2)=
(2A+3).(3A-2)=
(3X-5Y).(2X+3Y)=
(A+B-C).(A-B-C)=
(2X-3Y-Z).(2X-3Y+Z)=