x^2 4x 4分之x^2-4y
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2x-y分之x+y=2,则2x-y=2(x+y)4x-2y分之x+y-4x+4y分之2x-y=2(2x-y)分之x+y-4(x+y)分之2x-y=4(x+y)分之x+y-4(x+y)分之2(x+y)=
x+y分之4x-2y-2x-y分之4x+4y=2(2x-y)/(x+y)-4(x+y)/(2x-y)=2*2-4*(1/2)=4-2=2
1-x分之1+1+x分之1+1+x²分之2+1+x4次方分之4=1-x²分之(x+1+1-x)+1+x²分之2+1+x4次方分之4=1-x²分之1+1+x
1x^2y分之x^4=x²/y2ab分之ab-b^2(b不等于0)=1-b/a36abc^2分之36ab^3c=6b²/c4a^2-b^2分之(a+b)^3=(a+b)²
因为x+y分之2x-y=2又因为x+y分之4x-2y是它的2倍所以x+y分之4x-2y就=4因为x+y分之2x-y=2倒过来2x-y分之x+y就为1/2又2x-y分之4x+4y是2x-y分之x+y的4
原式=(x²-y²)²=(x+y)²(x-y)²
x+1/x=4=>x=2-3^0.5=>x^2=4x-1;x^2+1=4x=>x^4+x^2/(1+x^2)=(4x-1)^2+x^2/(4x)=16x^2-8x+1+x/4=16(4x-1)-8x+
x+2y+4y^2/(x-2y)-4x^2y/(x-4y^2)=x+2y+4y^2/(x-2y)-4x^2y/[(x+2y)(x-2y)]通分,分母为[(x+2y)(x-2y)]=(x+2y)(x+2
(2x4-4x3y-x2y2)-2(x4-2x3y-y3)+x2y2=2x4-4x3y-x2y2-2x4+4x3y+2y3+x2y2=2y3,因为化简的结果中不含x,所以原式的值与x值无关.
4分之x4次方y8次方-6x平方y平方+36y4次方=(1/2x²y的4次方-6y²)²如果本题有什么不明白可以追问,
X+(X+12)x5分之4=42X+0.8X+9.6=421.8X=32.4X=18X+(X+28)x4分之3=42X+0.75X+21=421.75X=63X=36X+(15+X)x5分之2=69X
解题思路:把分式的分子分母分解因式再根据法则进行计算,能约分的要先约分解题过程:答案见附件
1、实数2、X不等于03、X<=1.54、题目有问题,是2+3分之1X吗,那答案就是X>=-6
x=1/(√5-2)=√5+2x2=9+4√5原式=x2(x2+1)+2x-1=(9+4√5)(10+4√5)+17+8√5=170+76√5+17+8√5=187+84√5
解题思路:这是分式的除法,先变乘然后把分子分母因式分解,最后进行约分化成最简分式。解题过程:
因为x又x分之1=3,即x+1/x=3所以x+1/x=7则x^4+1/x^4=47所以:(x^10+x^8+x^2+1)/(x^10+x^6+x^4+1)=
3/4x-11/20x4=2两边乘2015x-44=4015x=44+4015x=84x=5.6
(x^4-y^4)÷(x^2+y^2)/(x+y)=(x^2-y^2)(x^2+y^2)÷(x^2+y^2)/(x+y)=(x^2-y^2)(x^2+y^2)*(x+y)/(x^2+y^2)=(x^2