1加x的平方分之x的四次方的不定积分
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由题意可得:x+1/x-1=7(x+1/x)^2=64所以x^2+1/x^2=62所以(x^4+x^2+1)/x^2=x^2+1+1/x^2=63再问:我看不懂,您能解释详细点吗?谢谢了再答:(x^2
x+1/x=3x^2+1=3x(平方)(x^2+1)^2=9x^2x^4+2x^2+1=9x^2x^4+x^2+1=8x^2x^2/(x^4+x^2+1)=1/8
(x的平方加x加1)分之x等于a∴(x²+x+1)/x=1/ax+1+1/x=1/ax+1/x=1/a-1=(1-a)/a两边平方得x²+2+1/x²=(1-a)
x^2-5x+1=0方程两边同除以xx-5+1/x=0x+1/x=5(x^4+1)/x^2=x^2+1/x^2=(x+1/x)^2-2=5^2-2=25-2=23
3-√5先求出x^2的值(x^4-1)+x^2+2x=(x^2+1)(x^2-1)+x^2+2x这样就好解多了
x+1/x=√5(x+1/x)²=(√5)²x²+2+1/x²=5x²+1/x²=3x²/(x^4+x²+1)分子分母除
∵x^2-3x+1=0显然x不等于0∴x-3+1/x=0∴x+1/x=3∴x^2+1/x^2+2=9∴x^2+1/x^2=7∴原式=1/(x^2+1+1/x^2)=1/(7+1)=1/8
x²+3x+1=0除以x得x+3+1/x=0x+1/x=-3∴(x+1/x)²=x²+2+1/x²=9即x²+1/x²=9-2=7∴﹙x
x的四次方+x的三次方+2x的平方+x+1=(x的四次方+x的三次方+x的平方)+(x的平方+x+1)=x的平方(x的平方+x+1)+(x的平方+x+1)=(x的平方+1)((x的平方+x+1))
解题思路:利用降次,整体代换的方法,由已知条件变换的思路来解。解题过程:
/>x的四次方加2x的三次方加x的平方加1加2乘(x加x的平方)=x^4+2x^3+x^2+1+2(x+x^2)=x^4+2x^3+x^2+1+2x+2x^2=x^4+2x^3+3x^2+2x+1=x
x的平方分之x的四次方加1=(x*x*x*x+1)/(x*x)=x*x+1/(x*x)由于x+1/x=a,所以(x+1/x)*(x+1/x)=x*x+2+1/(x*x)=a*a则有x*x+1/(x*x
由x^2+3x+1=0得x+3+1/x=0x+1/x=-3(x+1/x)^2=x^2+1/x^2+2=9x^2+1/x^2=7原式=x^2/(x^4+3x^2+1)=1/(x^2+3+1/x^2)=1
先分解因式,后乘法.(X^4-Y^4)/(X^3+X^2Y+XY^2+Y^3)=(X-Y)(X+Y)(X^2+Y^2)/(X^3+X^2Y+XY^2+Y^3)=(X-Y)(X^3+X^2Y+XY^2+
题中等式取倒,x+1+1/x=1/a,有x+1/x=-1+1/a两边平方得x方+1/x方=1/a方-2/a-1,得a方/(a-2)
(x+x分之1)乘(x的平方+x的平方分之1)乘(x的四次方+想的四次方分之1)=(x-1/x)乘(x+x分之1)乘(x的平方+x的平方分之1)乘(x的四次方+想的四次方分之1)÷(x-1/x)=(x
x²-4x+1=0两边同时除以xx-4+1/x=0x+1/x=4两边同时平方x²+2+1/x²=16x²+1/x²=14两边同时平方x^4+2+1/x
原式=[x/(x-y)]*[y^2/(x+y)]-[x^4y/(x^2+y^2)(x^2-y^2)]/[x^2/(x^2+y^2)]=xy^2/(x^2-y^2)-x^2y/(x^2-y^2)=xy(
/>∵x/(x²-x+1)=1/6∴(x²-x+1)/x=6x²-x+1=6xx²+1=7x∵(x²+1)×1/x=7x×1/xx²×1/x
x^4+x^3+(9/4)x^2+x+1=x^4+(1/2)x^3+x^2+(1/2)x^3+(1/4)x^2+(1/2)x+x^2+(1/2)x+1=x^2(x^2+(1/2)x+1)+(1/2)x