根据“杨辉三角”规律计算:2^5-5x2^4+10x2^3-10x2^2+5×2-1
根据“杨辉三角”规律计算:2^5-5x2^4+10x2^3-10x2^2+5×2-1
用杨辉三角规律计算下题 2^5-5x2^4+10x2^3-10x2^2+5x2-1
化简计算~1/(x2-5x+6) - 1/(4x-x2-3) - 1/(3x-x2-2)
5x2—[x2+(4x—x2)—2(x2—3x)]
f(x2-2)=lg(x2/x2-5)
计算:(-x+2x2+5)+(4x2-3-6x)
求和Sn=1x2+3x2^2+5x2^3+…+(2n-1)x2^n
2+5x2+5x2=?
(x2+5x+4)2+2(x2+5x+4)2+1=(x2+.
5x2+4-3x2-5x-2x2-5+6x.
Sn=1x2+3x2^2+5x2^3+...+(2n-1)2^n
(-2x2+3x)-[5x-(2x2+1)-x2].