答:(12✖️5+5✖️6+6✖️12)✖️2
=(60+30+72)x2
=(90+10+62)x2
=(100+62)x2
=100x2+62x2
=200+(60+2)x2
=200+60x2+2x2
=200+120+4
=324
解:有两种方法,不用笔算
1、(12×5+5×6+6×12)×2
=(2×5+5+12)×6×2
=(10+5+12)×12
=27×12
=27×(10+2)
=270+54
=324
2、(12×5+5×6+6×12)×2
=(60+30+72)×2
=162×2
=324
(12✖️5+5✖️6+6✖️12)✖️2
=[(12×5+6×12+5×6)]×2
=[12×(5+6)+5×6]×2
=[12×11+5×6]×2
=[132+30]×2
=162×2
=324
(2×6×5+5×6+12×6)×2
=(10×6+5×6+12×6)×2
=(10+5+12)×6×2
=27×6×2
=324
(12✖️5+5✖️6+6✖️12)✖️2
=(6✖️10+5✖️6+6✖️12)✖️2
=6✖️(10+5+12)✖️2
=6✖️27✖️2
=(10+2)✖️27
=270+54
=324