小學(xué)四年級(jí)數(shù)學(xué)簡便運(yùn)算歸類及其答案.doc

第一類：加65+73+135 357+288+143 272+68+28=65+135+73 =357+143+288 =272+28+68 =200+73 =500+288=300+68=273 =788 =368129+235+171+165 17+145+23+35 999+99+9+3=129+171+235+165 =17+23+145+35 =999+1+99+1+9+1=300+400 =40+180 =1000+100+10 =700 =220 =1110第二類：減400-256-44 517-53-47 284-159-41=400-（256+44） =517-(53+47) =284-(159+41)=400-300 =517-100 =284-200=100 =417 =84258-42-16 545-167-145 478-47-178=258-(42+16) =545-145-167 =478-178-47=258-58 =400-167 =300-47=200 =233 =253344-（144+37） 236-（177+36）=344-144-37 =236-177-36=200-37 =236-36-177=163 =200-177 =23 第三類：乘8（12513） （250125）（48）=812513 =25012548=100013 =25041258=13000 =10001000 =100000088125 72125 1256425=118125 =98125 =12582425=111000 =91000 =10002100=11000 =9000 =2000004212585 25488125=4251258 =254118125=2101000 =100111000=210000 =1100000第四類：乘（12+50）40 125（40-8） 76103=1240+5040 =12532 =76(100+3)=480+2000 =12584 =76100+763=2480 =10004 =7600+228 =4000 =782818125 2544 4225=92125 = 25411 =21225=9250 =10011 =2150=2250 =1100 =1050 999 9978=(100-1)9 =10078-78=900-9 =7800-78=891 =7722第五類：乘4537+3755 2821+2879 1723-237=37(45+55) =28(21+79） =23 （17-7）=37 100 =28 100 =2310=3700 =2800 =2303846+6438 9932+32 46+4659=38（46+64） =32（99+1） =46（1+59）=38110 =32100 =4660=38100+3810 =3200 =2760 =3800+380 =41801672+1673+1675 398+639-394=167(2+3+5) =39(8+6-4)=16710 =39 10=1670 =3902324+2542+2718+2581 9922+3334=238+258+278+258 =33322+3334=(23+25+27+25）8 =3366+3334=1008 =33（66+34）=800 =33100 =3300第六類：除36049 25052 600125=36036 =25010 =60060=10 =25 =1080058 480548 240512=80040 =480485 =240125=20 =105 =205 =2 =4 42035 240025 7800125=42075 =(24004)(254) =(78008)(1258)=605 =9600100 =624001000=12 =96 =62.4第七類：加減92+99 197+102 354-108=91+1+99 =197+2+100 =354-100-8=91+100 =199+100 =254-8=191 =299 =246 323+189-123 248-86+48 672-36+64=323-123+189 =248-(86-48) =636+64=200+189 =248-38 =700=389 =210 （6467-832）+（1832-1467） 1530+（592-530）-192=6467-832+1832-1467 =1530+592-530-192=6467-1467+1832-832 =1530-530+592-192=5000+1000 =1000+400=6000 =1400（2+4+6+98+100）-（1+3+5+97+99）=（2-1)+(4-3)+(6-5)+。+（98-97）+（100-99）=50第八類：乘除9604648 9900012111 3702381234=9604846 =99000(12111) =3702123438=2046 =9900011 =338=920 =9000 =114640（164） 1000（1254）=6404 =10001254=160 =84 =32第九類：加減乘除（98+147）49 （230-23）23 （250-25）25=9849 +14749 =23023 -2323 =25025-2525=2+3