Question

1计算（X-0.5）（X+0.5）（XX+0.25）____________

Answer 1

1、x^4-0.0625

2.(A^2+mA+1)(A-2)=A^3-2A^2+mA^2-2mA+A-2=A^3+(m-2)A^2+(1-2m)A-2

则1-2m=0

m=1/2

3.

x+y=10

则x^2+2xy+y^2=100

x^2+y^2=100-2xy=100-48=52