简便计算59x38+61x59+59(
简便计算59x38+61x59+59? -
解:=59×(38+61+1)=59×100 =5900
31X39=1209,32X38=1216,33X37=1221,34X36=1224,35X35=1225;41X49=2009,42X48=2016,43X47=2021,44X46=2024,45X45=2025;51X59=3009,52X58=3016,53X57=3021,54X56=3024,55X55=3025;61X69=4209,62X68=4216,63X67=4221,64X66=4224,65X65=4225;71X79=5609,72X7希望你能满意。
解:=59×(38+61+1)=59×100 =5900
31X39=1209,32X38=1216,33X37=1221,34X36=1224,35X35=1225;41X49=2009,42X48=2016,43X47=2021,44X46=2024,45X45=2025;51X59=3009,52X58=3016,53X57=3021,54X56=3024,55X55=3025;61X69=4209,62X68=4216,63X67=4221,64X66=4224,65X65=4225;71X79=5609,72X7希望你能满意。
十位数相同的两位数相乘,所得的积无论是三位数还是四位数,积个位的数字,都与十位数相同的两位数个位的数相乘的积相同,例如:14×14=196,24×24=576,84×84=7056,94×94=8836 乘法也可以被视为计算排列在矩形(整数)中的对象或查找其边长度给定的矩形的区域。矩形的区域不取决于首先测量哪等我继续说。
31X39=1209,32X38=1216,33X37=1221,34X36=1224,35X35=1225;41X49=2009,42X48=2016,43X47=2021,44X46=2024,45X45=2025;51X59=3009,52X58=3016,53X57=3021,54X56=3024,55X55=3025;61X69=4209,62X68=4216,63X67=4221,64X66=4224,65X65=4225;71X79=5609,72X7等我继续说。
相同的数相乘例如15乘15,25乘25,35乘35等的规侓是 -
31X39=1209,32X38=1216,33X37=1221,34X36=1224,35X35=1225;41X49=2009,42X48=2016,43X47=2021,44X46=2024,45X45=2025;51X59=3009,52X58=3016,53X57=3021,54X56=3024,55X55=3025;61X69=4209,62X68=4216,63X67=4221,64X66=4224,65X65=4225;71X79=5609,72X等会说。
31X39=1209,32X38=1216,33X37=1221,34X36=1224,35X35=1225;41X49=2009,42X48=2016,43X47=2021,44X46=2024,45X45=2025;51X59=3009,52X58=3016,53X57=3021,54X56=3024,55X55=3025;61X69=4209,62X68=4216,63X67=4221,64X66=4224,65X65=4225;71X79=5609,72X等我继续说。
1.98乘以55乘50等于5.06 -
解:1.98乘以55乘50 =1.98x55x50 =1.98x(55x50)1.98x2750 =2x2750-0.02x2750 =5500-55 =2445 1.98乘以55乘50等于2445
95X95=9025即A5XA5=PQ25,结果中的前两位数PQ=AXA+A=AX(A+1)后两位数都是5X5=25.2)十位数相同,个位数相加等于10的两位数乘法.11X19=209,12X18=216,13X17=221,14X16=224,15X15=225;21X29=609,22X28=616,23X27=621,24X26=624,25X25=625;31X39=1209,32X38=1216,33X37=1221,好了吧!
1.98乘以55乘50等于5.06 -
31X39=1209,32X38=1216,33X37=1221,34X36=1224,35X35=1225;41X49=2009,42X48=2016,43X47=2021,44X46=2024,45X45=2025;51X59=3009,52X58=3016,53X57=3021,54X56=3024,55X55=3025;61X69=4209,62X68=4216,63X67=4221,64X66=4224,65X65=4225;71X79=5609,72X78=5616,73X77有帮助请点赞。
15×15=225;25×25=625;55×55=3025;65×65=4225;通过计算可以发现规律,n5×n5=n×(n+1)×100+25;这个规律可以使用平方展开式进行解释:(n5)(10n+5)#178;=(10n)#178;+5²+2×10n×5=n×(n+1)×100+25。