48×36 24×28 333×21 999×93(简便方法)
4个回答
展开全部
48×36 24×28 333×21 999×93(简便方法)
48×36
=(50-2)×(40-4)
=2000-200-80+8
=2000-280+8
=2000-300+20+8
=1728
24×28
=(20+4)×(30-2)
=600-40+120-8
=600-100+120+60-8
=500+180-8
=680-8
=672
333×21
=(300+33)×(20+1)
=6000+300+660+33
=6900+60+33
=6900+100-7
=7000-7
=6993
999×93
=(1000-1)×(100-7)
=100000-7000-100+7
=93000-100+7
=92900+7
=92907
48×36
=(50-2)×(40-4)
=2000-200-80+8
=2000-280+8
=2000-300+20+8
=1728
24×28
=(20+4)×(30-2)
=600-40+120-8
=600-100+120+60-8
=500+180-8
=680-8
=672
333×21
=(300+33)×(20+1)
=6000+300+660+33
=6900+60+33
=6900+100-7
=7000-7
=6993
999×93
=(1000-1)×(100-7)
=100000-7000-100+7
=93000-100+7
=92900+7
=92907
展开全部
48×36=(50-2)(40-4)=50×40-50×4-2×40+2×4=1728
24×28=(25-1)(30-2)=25×30-25×2-1×30+1×2=672
333×21=(300+30+3)×20+(300+30+3)×1=6000+600+60+333=6993
999×93=(1000-1)×90+(1000-1)×3=90000-90+3000-3=92907
24×28=(25-1)(30-2)=25×30-25×2-1×30+1×2=672
333×21=(300+30+3)×20+(300+30+3)×1=6000+600+60+333=6993
999×93=(1000-1)×90+(1000-1)×3=90000-90+3000-3=92907
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
展开全部
48*36=50*36-2*36=1800-72=1728
24*28=24*30-24*2=720-48=672
333*21=333*20+333*1=6660+333=6993
999*93=1000*93-1*93=93000-93=92907
24*28=24*30-24*2=720-48=672
333*21=333*20+333*1=6660+333=6993
999*93=1000*93-1*93=93000-93=92907
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
2016-07-11 · 知道合伙人教育行家
关注
展开全部
48×36+24×28
=24x2x36+24x28
=24x72+24x28
=24x(72+28)
=24x100
=2400
333×21+999×93
=333x3x7+999x93
=999x7+999x93
=999x(7+93)
=999x100
=99900
=24x2x36+24x28
=24x72+24x28
=24x(72+28)
=24x100
=2400
333×21+999×93
=333x3x7+999x93
=999x7+999x93
=999x(7+93)
=999x100
=99900
本回答被网友采纳
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询