小学4年纪数学习题

50*590-4*1
=29500-4
=29496

46×589
=46×（600-10-1）
=46×600-46×10-46×1
=27600-460-46
=27140-46
=27094

46×589
=（50-4)×589
=50×589-4×589
=50×(600-10-1)-4×(600-10-1)
=(30000-500-50)-(2400-40-4)
=30000-500-50-2000-400+40+4
=(30000-2000)-400-500-50+40+4
=28000-900-10+4
=27100-10+4
=27090+4
=27094

(50-4)*(600-11)
=50*600-50*11-4*600+4*11
=30000-550-2400+44
=30000-(550+2400-44)
=30000-2906
=30000-(3000-94)
=30000-3000+94
=27000+94
=27094

46×589
=46×（500+80+9）
=46×500+46×80+46×9
=23000+3680+414
=27094
可以应用乘法分配律。

46*589
=46*（600-10-1）
=46*600-46*10-46*1
=27600-460-46
=27140-46
=27094