四年级脱式计算极简便运算大全
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/22 23:31:27
肯定可以,不过别用错了规律
2/15-1/12+2/5=8/60-5/60+24/60=27/60=9/20
3600÷450=(3600×2)÷(450×2)=7200÷900=72÷9=8
7034044÷(6799-3771)×3388=2)806+3504-5366515÷1855=3)6408-2595+1828×1514=4)4003449÷(7056-3643)×2850=5)
加法交换律:a+b=b+a加法结合律:a+b+c=(a+b)+c乘法交换律:abc=acb乘法分配律:(a+b)c=ac+bc除法分配律:(a+b)÷c=a/c+b/c
再问:对吗
120+90=543-306=300÷12=120×5=12+18+14=62+160+38=14×60=203-80=50×15×4=175-56=250×8=420×20=25+67+75=450
2.87×〔6.3-2.3〕=2.87×4.0=11.4854.7-45.3÷15=54.7-3.02=51.682.008×1999+2.008=4013.992+2.008=401610.8÷〖〔
158+262+138375+219+381+2255001-247-1021-232(181+2564)+2719378+44+114+242+222276+228+353+219(375+1034
25×1/4加25×0.251.999减1加0.00199×0.36529587OK
1.9999×1111+3333×6667=3333×3333+3333×6667=3333×(3333+6667)=3333×10000=333300002.1005*10061006+1066*1
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一、用竖式计算21.5÷2.4=900÷2.4=5.6×0.35=二、脱式计算.175-75÷2568+35×137.25-(1.25+2.37)(11.4+16.6)÷3543.2÷(9×8)189
1.95.6*18+0.4*18=(95.6+0.4)*18=96*18=17282.907*99+907=907*(99+1)=907*100=907003.0.6*143-0.6*43=0.6*(
32*12.5*0.25=4*8*12.5*0.25=100*1=100
2.原式=91*(1/7-1/13)=91/7-91/13=13-7=64.原式=2.9*3/1=8.7第四题没法简便运算
http://www.zhaojiaoan.com/soft/show.asp?id=7111《简便计算》说课稿人教版四年级下数学[四年数学说课]一,说教材:《简便计算》这一课是人民教育出版社第八册数