计算【2.15+5.17+3.62】乘【5.17+2.15+8.5】-【3.62+2.15+8.5+5.17】乘【2.15+5.17】一定要简便运算,一定要的,说出来的我给分30

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/08 19:55:55

计算【2.15+5.17+3.62】乘【5.17+2.15+8.5】-【3.62+2.15+8.5+5.17】乘【2.15+5.17】一定要简便运算,一定要的,说出来的我给分30
计算【2.15+5.17+3.62】乘【5.17+2.15+8.5】-【3.62+2.15+8.5+5.17】乘【2.15+5.17】
一定要简便运算,一定要的,说出来的我给分30

计算【2.15+5.17+3.62】乘【5.17+2.15+8.5】-【3.62+2.15+8.5+5.17】乘【2.15+5.17】一定要简便运算,一定要的,说出来的我给分30
【2.15+5.17+3.62】乘【5.17+2.15+8.5】-【3.62+2.15+8.5+5.17】乘【2.15+5.17】
=(2.15+5.17)(2.15+5.17)+(2.1+5.17)(3.62+8.5)+3.62*8.5
-(2.15+5.17)(2.15+5.17)-(3.62+8.5)(2.15+5.17)
=3.62*8.5
=1.81*17
=0.11*17*17
=0.11*279
=27.9+2.79
=30.69