4x+4*1.25x=360

4x+x×1.25x=360(解方程)1.25x^2+4x-360=05x^2+16x-1440=0x1,2=[-16土√(256+20×1440)]/10=[-16土16√(113.5)]/10=1.6[-1土√113.5]x1=1.6(

4*1.25x+4x=360是不是求X5x+4x=3609x=360x=40

(x+1.25x)乘4=360,2.25x×4=3602.25x=360÷42.25x=90x=90÷2.25x=40

4（x+1.25x）=360x十1.25x=902.25x=90x=404x+5x=3609x=360x=360÷9x=40=4（2.25X）=3604（x+1.25x）=360x+1.25x=902.26x=90x=40x+1.25x=5

(X-1)(X-2)=X*X-3X+2X*X-3X+2=(X-1)(X-3)X*X+4X+4=X(X-4)+4X*X+Y*Y=(X+Y)(X-Y)哪一个因式分解是正确的第一个正确.其余正确形式是：X*X-4X+3=(X-1)(X-3)X*X

x^2+x^-2=x^4,化简(x+x^-1+x2)(x-x^-1+x²)（-x+x^-1+x²）(x+x^-1-x²)第18题,

已知X=4-根号3求(X*X*X*X-6X*X*X-2X*X+18X+23)/(X*X-8X+15)的值紧急,,明天有用,,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-

3/(7X)+4/7(1.25X)=1/X3/(7X)+4/7(1.25X)=1/X-8两边同乘以7*1.25x,3*1.25+4=7*1.25-8*7*1.25x70x=(7-3)*1.25-4x=1/70

210-x=360-4x,求x210-x=360-4x3x=150所以x=50

x-2x+3x-4x+5x.+99x-100x=25求解x(1-2+3-4+...+99-100)=25x[(1-2)+(3-4)+...+(99-100)]=25x(-1×50)=25x=25/(-50)=-1/2x-2x+3x-4x+.

先化简,再求值：（x-2/x-x+2/x)/x-2/4x,x=2011能不能先用（）把每个分数括起来?[(x-2)/x-(x+2)/x]/(x-2)/4x=[(x-2-x-2)/x]*4x/(x-2)=-4/x*4x/(x-2)=-16/(

2x+3x+4x+5x+x+6x+7x=1002x+3x+4x+5x+x+6x+7x=10028x=100x=100/28x=25/727x=100x=100/27；；；；；；；；；；；速率可达粉色礼服螺丝钉解放isskl其实我不会2x+3

(x-3/x-2)-(x-2/x-1)=(x-5/x4)-(x-4/x-3)

x(x+1)+(x+2)+(x+3)+(x+4)+(x+5)=27求xx²＋x＋x＋2＋x＋3＋x＋4＋x＋5=27x²＋5x＋14=27x²＋5x－13=0x=(－5±√77)/2无解X=2没有实数解吧！化简

提取公因式:已知x*x-5x+1=0求x*x*x-4x*x-4x-1即x²-5x=-1所以原式=x³-5x²+x²-5x+x-1=x(x²-5x)+(x²-5x)+x-1=-x-1

X+X+X+(X-1)+(X-2)+(X-3)+(X-4)=10(X-3)+(X-4)7x-10=11x-34-4x=-24x=6

x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7x=?x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+71+1/(x+1)-1-1/(x+3)=1+1/x+5)-1-1/(x+7)1/(x+1)+1/(x+7)=1

x-4/x-5-x-5/x-6=x-7/x-8-x-8/x-9求x=?(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)(

解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1(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))+

x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002=x^2002(x^4+x^3+x^2+x+1)=0提取公因式就行了提取公因式原式=x^2002*(x^4+x^3+x^2+x+1)=0