1.1/2:1/5=1/4:x2.0.8:4=x:83.3/4:x=3:124.36/x=54/35.2/9=8/x6.1.25:0.25=x:1.6
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2^5+5x2^4+10x2^3+10x2^2+5x2+1
已知x2-4x+1=0,求x2/(x2)2-3x2+1
1/(x2+x)+1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)=4/21x2是x的平方
4x2.5x2+4x2×2+2x2.5x2=
计算:x2-5x+6/x2-4x+3 + x2-4x+3/x2-2x+1 + x2-3x-4/1-x2
若 x2-3x+1=0,求(2x2×x3-5x2×x2+2 x3-8x2 )÷(x2+1 )的值
x2-5x+1=0则x2+x2/1
用excel解 (1)maxz=2x1+2x2 (2)maxz=X1+X2 (3)maxz=10x1+5x2 (4)maxz=2x1+x2 (5)maxz=3x1+5x2(1)maxz=2x1+2x2 x1-x2>=-1-0.5x1+x2=0(2)maxz=X1+X2 x1-x2>=03x1-x2=0(3)maxz=10x1+5x23x1+4x2
(1-x2)(x2-4x+5)
不等式(x2-4x-5)(x2+1)
4x2-(x2+1)2因式分解
已知x2+5x-4=0,求x3+6x2+x+2的值已知x2+x-1=0,求x3+2x2+3的值
用杨辉三角规律计算下题 2^5-5x2^4+10x2^3-10x2^2+5x2-1
求和Sn=1x2+3x2^2+5x2^3+…+(2n-1)x2^n
Sn=1x2+3x2^2+5x2^3+...+(2n-1)2^n
3/x2 -3x+2-1/x-2=1/x2 -x+4/x2 -2x
1+2x2+3x2^2+4x2^3+.+nx2^n-1=?
1+2x2+3x2^2+4x2^3+.+nx2^n-1=?