=12×40-12×5
=480-60
=420
=(360+5)*(12-12)
=365*0
=0
78×12
=(80-2)×12
=80×12-2×12
=960-24
=936
501×12
=(500+1)×12
=500×12+1×12
=6000+12
=60012
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
=(12÷12)×(6×6)
=1×36
=36
999.92*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)×5
=(100+24-30-8)×5
=500+120-150-40
=620-190
=430
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
960×12÷480
=(960÷480)×12
=2×12
=24