初一数学题,急急

11 |

1 | 2008-3-30 10:33:26 | 显示全部楼层 |阅读模式

1.345^2*0.345-1.345^2-1.345*0.345^2令x=1.345,0.345=x-11.345^2*0.345-1.345^2-1.345*0.345^2=x^2*(x-1)-x^2-x*(x-1)^2=x^3-x^2-x^2-x(x^2-2x+1)=x^3-2x^2-x^3+2x^2-x=-x=-1.345

使用道具举报

千问 | 2008-3-30 10:33:26 | 显示全部楼层

1.345^2*0.345-1.345^2-1.345*0.345^2 令x=1.345,0.345=x-1 1.345^2*0.345-1.345^2-1.345*0.345^2 =x^2*(x-1)-x^2-x*(x-1)^2 =x^3-x^2-x^2-x(x^2-2x+1) =x^3-2x^2-x^3+2x^2-x =-x =-1.345答:结果为-1.345

使用道具举报