X=(X*.14)*0.9-50=145
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(3x+5)/(x+2)=[(3x+6)-1]/(x+2)=3-1/(x+2)后面都类似化简3-1/(x+2)+3-1/(x+9)=3-1/(x+6)+3-1/(x+5)1/(x+2)+1/(x+9)
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)
再答:对吗?再问:,没过程再问:,没过程再问:,没过程再答:不是有过程了吗?再问:哦谢谢
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550120x=550x=55/12=4.583
x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊
(x-1)(2x-1)-(x+1)*(x+1)+1=(2x²-3x+1)-(x²+2x+1)+1=2x²-3x+1-x²-2x-1+1=x²-5x+1
全错5x+2=-85x=-10x=-23x=5x-14-2x=-14x=77-2x=3-4x2X=-4x=-21/2x+1=3-x3/2x=2x=4/3再问:最后一题的2为什么不是-2?再答:3-1=
1、14(x+6)-6x=8(2x+5)解14x+84-6x=16x+408x=44x=11/22、0.25x+4=30%x+3解0.25x+4=0.3x+30.05x=1x=203、甲数的1/3等于
(4+5)X+14=42-2X-2*39x+14=(42-6)-2x9x+2x=42-6-1411x=22x=2
5(x-1.7)=3(x+0.9)5x-8.5=3x+2.75x-3x=2.7+8.52x=11.2x=5.6再问:x+400分之0.6+400=3分之2,拜托
5x-14x-2=14x-9x-2=14x-9x-14x=2-23x=2x=-23/2
解题思路:先化简代数式,再把x²-5x=14代入进行计算解题过程:0最终答案:略
x³-5x²-14x=X(X²-5X-14)=X(X-7)(X+2)
解析:已知x²-5x=14,那么:(x-1)(2x-1)-(x+1)²+1=2x²-3x+1-x²-2x-1+1=x²-5x+1=14+1=15再问:
(5x+14)÷(x+2)==(5x+14)/(x+2)最简形式,不要再算了再问:[(x+2)²+2(x+2)(x-2)-3(x+2)(x-3)]÷(x+2)=?化简再答:[(x+2)&su
-2或7再问:套在(x-1)(2x-1)-(x+1)方+1里用哪个?各算一遍?
#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-1=3X+32X=-4;X=-2x-3=12-4x5X=15;x=36x-14=5x-10x+1=2-4x5x=1;x=0.2
x=-40
X^2+5X-14+(X+1)(X^2+2X+1)=(x-2)(x+7)+(x+1)(x+1)=(5-2)*(5+7)+(5+1)^2=72