(324一285)X12/26=39X12/26=3x12/2=18
简便方法计算如下:
(324-285)×12÷26
=39×12÷(13×2)
=39×12÷13÷2
=(39÷13)×(12÷2)
=3×6
=18
(324-285)×12÷26
=39×12÷(13×2)
=39×12÷13÷2
=(39÷13)×(12÷2)
=3×6
=18
=39*12/26
=12*39/(13*2)
=12*39/13/2
=12*3/2
=3*12/2
=3*6
=18
这个不算复杂了吧!楼上正解