12乘以(40—5)的
简便计算12乘以(40—5)的简便计算＝12×40-12×5
＝480-60
＝420
360+5乘以12-12简便计算=（360+5）*（12-12）
=365*0
=0
78乘以12的简便计算78×12
=(80-2)×12
=80×12-2×12
=960-24
=936
501乘以12的简便计算501×12
=（500+1）×12
=500×12+1×12
=6000+12
=60012
103乘以12的简便计算103乘以12的简便计算
解：
103×12
=(100+3)×12
=100×12+3×12
=1200+36
=1236
12乘以6除以12乘以6的简便计算12乘以6除以12乘以6
=（12÷12）×（6×6）
=1×36
=36
简便计算999.92乘以12+1111乘以7.2999.92*12+1111*7.2
=9999*1.2+0.2*1.2+1111*9*0.8
=9999*2+0.2*1.2
=20000-2+0.24
=19998.24
(124—38)乘以5的简便计算(124-38)×5
=(100+24-30-8)×5
=500+120-150-40
=620-190
=430
4.6乘以56加4.8乘以46减0.46乘以40简便计算4.6×56+4.8×46-0.46×40
=4.6×56+4.6×48-4.6×4
=4.6×(56+48-4)
=4.6×100
=460
960乘以12除以480简便计算960×12÷480
=（960÷480）×12
=2×12
=24