来自顾晓鹤的问题
1.(3x²-2x+1)(x+b)的乘积中不含x²项,求b的值.2.如果2x-y=8,求代数式[(x²+y²)-(x-y²)+2y(x-y)]÷(4y)的值.3.若x²+x-1=0,m(立方)+2m²+2009的值.4.已知2(a次方)=3,2(b次方)=6,2(c次方)=12,试探究a,b
1.(3x²-2x+1)(x+b)的乘积中不含x²项,求b的值.
2.如果2x-y=8,求代数式[(x²+y²)-(x-y²)+2y(x-y)]÷(4y)的值.
3.若x²+x-1=0,m(立方)+2m²+2009的值.
4.已知2(a次方)=3,2(b次方)=6,2(c次方)=12,试探究a,b,c之间的等量关系.
第三题错了,应该是:
若x²+x-1=0,x(立方)+2x²+2009的值.
