(98 x) (162 x)=0.618怎么算
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1X+2X+3X…+98X+99X+100X=5050x=50500x=10
x^4+x^3+x^2+x+1=0,x^100+x^99+x^98+x^97+x^96=x^96(x^4+x^3+x^2+x+1)=x^96*0=0
因为x^4+x^3+x^2+x^2+1=0所以x^100+x^99+x^98+x^97+x^96=x^96(x^4+x^3+x^2+x^2+1)=x^96*0=0
x^100+X^99+X^98+X^97+X^96=x^96(x^4+X^3+X^2+X^1+1)=k^96*0=0
1/x(x+1)(x+2)+1/(x+1)(x+2)(x+3).+1/(x+98)(x+99)(x+100)=(1/2){[1/x(x+1)-1/(x+1)(x+2)]+[1/(x+1)(x+2)-1
提公因式法吧x^97+x^98+x^99+x^100+x^101+x^102+x^103=x^97(1+x+x^2+x^3+x^4+x^5+x^6)因为1+x+x^2+x^3=0所以原式=x^97(x
1.3X=2.6X=2
0.3X+12-0.6X=9-0.3X=3X=10
1.5X+7.4=0.6x+9.21.5x-0.6x=9.2-7.40.9x=1.8x=2
138+x=3*(98-x)138+x=294-3xx+3x=294-1384x=156x=39
(X+X)+(X-X)+(X*X)+(X/X)=1002X+0+X*X+1=1002X+X*X=99X(X+2)=99X=9再问:请问X(X+2)=99解为什么就等于9了呢没看懂再答:换成算术法你就明
X-0.6X=-3.60.4X=-3.6X=-3.6÷0.4X=9,
1.6x=70再答:x=再问:x=什么再答:43.75再答:请采纳吧
0.6(5x-4.5x)=93x-2.7x=90.3x=9x=30
x-0.6x=5.6(1-0.6)x=5.60.4x=5.6x=5.6÷0.4x=14
(0.6x+420)/(x+20)=30.6x+420=3x+600.6x+420-60=3x0.6x+360=3x3x-0.6x=3602.4x=360x=150
#includesintjiesheng(intn)//用于计算阶乘如:3!{if(n=1)rerunn;returnn*hh(n-1)}doubledigui(intn,intx)//用以计算y=x
X-0.6X=200.4x=20x=50
2x等于x+15x等于15