简便计算 33333×33333和1992×27.5+1982×72.5
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 08:12:19
![简便计算 33333×33333和1992×27.5+1982×72.5](/uploads/image/z/645942-30-2.jpg?t=%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97+33333%C3%9733333%E5%92%8C1992%C3%9727.5%2B1982%C3%9772.5)
简便计算 33333×33333和1992×27.5+1982×72.5
简便计算 33333×33333和1992×27.5+1982×72.5
简便计算 33333×33333和1992×27.5+1982×72.5
1.33×33=1089
333×333=110889
3333×3333=11108889
所以,33333×33333=1111088889
2.1992×27.5+1982×72.5
=(1982+10)×27.5+1982×72.5
=1982×27.5+275+1982×72.5
=1982×(27.5+72.5)+275
=198200+275
=198475
楼主给分
1992×27.5+1982×72.5
=1982×27.5+10×27.5+1982×72.5
=1982×(27.5+72.5)+275
=1982×100+275
=198200+275
=198475
1992×27.5+1982×72.5
=1992×(100-72.5)+1982×72.5
=1992×100-1992×72.5+1982×72.5
=1992×100-10×72.5
=199200-725
=198475
33333*33333 =33333*3*11111=99999*11111
=(100000-1)*11111=11111*100000-11111
=1111088889
1992*27.5+1982*72.5=(1982+10)*27.5+1982*72.5
=1982*100+275=198475
第一题好难!第二题:1992*27.5+1982*72.5=(1982+10)*27.5+1982*72.5+1982*27.5+275+1982*72.5=1982*(27.5+72.5)+275=198200+275=198475