(x^2 1)dy dx 2xy=4x^2

4(x^2-7x+10)-(2x+3)(2x-1)=-214x^2-28x+40-(4x^2-2x+6x-3)=-214x^2-28x+40-4x^2+2x-6x+3+21=0-32x+64=0x=2

是这样的：x^5+x^4=x^3(x^2+x)=(x^2+x)[(x^3-1)+1]=(x^2+x)(x^3-1)+x^2+x=[x(x+1)(x-1)](x^2+x+1)+x^2+x=(x^3-x)

x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊

2x+3x+4x+5x+x+6x+7x=10028x=100x=100/28x=25/7

(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=(x/2)*(2/x(x+2))+(2/(x+2)(x+4))+.+2/(x+8)(x+10)=(x/2)*[1/x

2x方-3x+2x根号x方-3x+4=212x^2-3x+2x√(x^2-3x+4)=21x^2-3x+4+2x√(x^2-3x+4)+x^2=25[√(x^2-3x+4)+x]^2=25√(x^2-

即x²-5x=-1所以原式=x³-5x²+x²-5x+x-1=x(x²-5x)+(x²-5x)+x-1=-x-1+x-1=-2

这个可以因式分解,呵呵原式=(-x+4)(2x+1)(x-2)(x-1)所以x=4,-0.5,2,1给分吧……对于高次的方程的求解,本人才疏学浅,没有什么特殊的方法,只能去猜根,例如,我先猜出了x=1

1/4X=13X=5210/3X=20/21X=2/70.72X=12.96X=18

35(X-2)+15(5X-6)=(22X-51)+21(3X-4)35X-70+75X-90=22X-51+63X-8435X+75X-22X-63X=-51-84+70+9025X=25X=1再问

题目应是1/(x^2+x﹚+1/(x^2+3x+2﹚+1/(x^2+5x+6﹚+1/(x^2+7x+12﹚=4/211/x(x+1﹚+1/(x+1)(x+2)+1/(x+2)(x+3)+1/(x+3)

设x1=4-√3,x2=4+√3,是方程X^2-8X+13=0的两根所以X1^2-8X1+15=2X^4-6X^3-2X^2+18X+23=(X+1)^2*(X^2-8X+13)+10=10所以原式=

首先(x^2-2x+1)恒大于零,所以可以乘到不等式右边,然后化简最后可得-8

101.5.-0.05527/342.6161.90.966.378.1101/3563/1315/334.674.5

(5x-96)/(x-19)+(x-8)/(x-9)=(4x-19)/(x-6)+(2x-21)/(x-8)5-1/(x-19)+1+1/(x-9)=4+5/(x-6)+2-5/(x-8)即1/(x-

首先回答:X7X-X7X=X98设被减数的百位数字是a,个位数字是b,其中(0

x+21%x=36.3x+0.21x=36.31.21x=36.3x=30x-29%x=213x-0.29x=2130.71x=213x=30060%x+25%x=10.20.6x+0.25x=10.

(X-4)/(X-5)-(X-5)/(X-6)=(X-7)/(X-8)-(X-8)/(X-9)[(x-4)(x-6)-(x-5)2]/(x-5)(x-6)=[(x-7)(x-9)-(x-8)2]/(x

能不能先用（）把每个分数括起来?

35(x-2)-15(5x-6)=(22x-63)-21(3x-4)35x-70-75x+90=22x-63-63x+84-45x+20=-41x+2145x-41x=20-214x=-1x=-1/4