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

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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+5.1

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