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1、第一讲 速算与巧算基础班1用简便方法求和:536+(541+464)+459 588264148 899634587546 567+558+562555563解答: 536(541464)459(536+464)+(541459)=2000 588264148=588+(12+252)+148(58812)+(252148)600+400=1000 899634587546=(89964)(34547546)=9000+11000(把 3458分成 4和=9000+11000 3454)20000 567558+5625555635605+(7-2+2-5+3)(以560为基准数)2800+5
2、28052用简便方法求差: 1870-280-520 4995-(995-480) 4250-29494 1272-995解答: 1870-280-5201870-(280+520)=1870-80010704995-(995-480)=4995-995+480=4000+480=4480 4250-29494=4250-(294-94)=4250-200=4050 1272-995=1272-1000+5=2773用简便方法计算下列各题: 478-128+122-72 464-54599+345 537-(543-163)-57 947+(372-447)-572解答: 478-128122
3、-72=(478+122)-(12872)600-200400 464-54599345464-(545-345)+100-1=464-200100-1363 537-(543-163)-57537-543163-57=(537163)-(543+57)=100 947(372-447)-572=947+372-447-572=(947-447)-(572-372)=3004计算下面各题:231010101 456810001000172125 4599 7536解答: 23232323 456845684568 9000 4455 2700 提高班1用简便方法求和:536+(541+464)
4、+459 588264148 899634587546 567+558+562555563解答: 536(541464)459(536+464)+(541459)=2000 588264148=588+(12+252)+148(58812)+(252148)600+400=1000 899634587546=(89964)(34547546)=9000+11000(把 3458分成 4和=9000+11000 3454)20000 567558+5625555635605+(7-2+2-5+3)(以560为基准数)2800+528052用简便方法求差: 1870-280-520 4995-(9
5、95-480) 4250-29494 1272-995解答: 1870-280-5201870-(280+520)=1870-80010704995-(995-480)=4995-995+480=4000+480=4480 4250-29494=4250-(294-94)=4250-200=4050 1272-995=1272-1000+5=2773用简便方法计算下列各题: 478-128+122-72 464-54599+345 537-(543-163)-57 947+(372-447)-572解答: 478-128122-72=(478+122)-(12872)600-200400 46
6、4-54599345464-(545-345)+100-1=464-200100-1363 537-(543-163)-57537-543163-57=(537163)-(543+57)=100 947(372-447)-572=947+372-447-572=(947-447)-(572-372)=3004计算下面各题:231010101 456810001000172125 4599 7536解答: 23232323 456845684568 9000 4455 2700 5计算下面各题:7783 566413473 911101解答:6391 3584 9782 9999精英班1用简便方
7、法求和:536+(541+464)+459 588264148 899634587546 567+558+562555563解答: 536(541464)459(536+464)+(541459)=2000 588264148=588+(12+252)+148(58812)+(252148)600+400=1000 899634587546=(89964)(34547546)=9000+11000(把 3458分成 4和=9000+11000 3454)20000 567558+5625555635605+(7-2+2-5+3)(以560为基准数)2800+528052用简便方法求差: 187
8、0-280-520 4995-(995-480) 4250-29494 1272-995解答: 1870-280-5201870-(280+520)=1870-80010704995-(995-480)=4995-995+480=4000+480=4480 4250-29494=4250-(294-94)=4250-200=4050 1272-995=1272-1000+5=2773用简便方法计算下列各题: 478-128+122-72 464-54599+345 537-(543-163)-57 947+(372-447)-572解答: 478-128122-72=(478+122)-(12
9、872)600-200400 464-54599345464-(545-345)+100-1=464-200100-1363 537-(543-163)-57537-543163-57=(537163)-(543+57)=100 947(372-447)-572=947+372-447-572=(947-447)-(572-372)=3004计算下面各题:231010101 456810001000172125 4599 7536解答: 23232323 456845684568 9000 4455 2700 5计算下面各题:7783 566413473 911101解答:6391 3584 9782 99996. 计算:917+9117-517+4517. 解答:917+9117-517+4517 =917-517+9117+4517 =(9-5)17+(91+45)17 =417+13617 =68+8 =76