简便计算:(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/17 16:21:08
简便计算:(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)
x){ɾ/-|n=4 􌌁 $L5u!BHj4mk~ dG[ej7~[ @ML-G2[GmG#D\QḢȃ6yvP/؀9O'OvxyӎOu?7i^t ]O'<πhE2!V#v>Շ/S@2WG{:u ө 8) lZȒPFk9šU626Rp`kj#

简便计算:(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)
简便计算:(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)

简便计算:(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)
令A=0.23+0.34=0.57
原式=(1+A)*(A+0.65)-(1+A+0.65)*A
=A+A2+0.65A+0.65-A-A2-0.65A
=0.65

后面用乘法分配律得到
(0.23+0.34+0.65)*(0.23+0.34)+(0.23+0.34)
和前面得到
(0.23+0.34+0.65)*[1+0.23+0.34-(0.23+0.34)]-(0.23+0.34)
等于0.65

设 1+0.23+0.34=A
A*(A-1+0.65)-(A+0.65)(A-1)
=A*(A+0.65)-A-[(A+0.65)*A-(A+0.65)}
=A*(A+0.65)-A-(A+0.65)*A+(A+0.65)
=0.65

(0.23+0.34+0.65)+(0.23+0.34+0.65)(0.23+0.34)-(0.23+0.34)-(0.23+0.34)(0.23+0.34+0.65)
=0.65