ldcf.net
当前位置:首页 >> 先化简,再求值:(x+1)(2x%1)%(x%3)²,... >>

先化简,再求值:(x+1)(2x%1)%(x%3)²,...

(x+1)(2x-1)-(x-3)² =2x²-x+2x-1-(x²+9-6x) =2x²+x-1-x²-9+6x =x²+7x-10 x=-2 x²+7x-10=2²-7*2-10=-20 望采纳 祝你学习进步~~

解:原式=[x 2 ﹣2x+1﹣(x 2 ﹣1)+x 3 ]÷2x=(x 2 ﹣2x+1﹣x 2 +1+x 3 )÷2x=(x 3 ﹣2x+2)÷2x;当x= 时,原式=( ﹣1+2)÷1= .

求解答网可以找到原题的,贴吧搜“求解答”可以找到使用攻略,答案如下,求采纳

2x(x+2)+(x-3)×(x-1) =2x的2次方+4x+x的2次方-4x+3 =3x的2次方+3

这题答案是-7

[1/(x+1)+(x^2-2x+1)(x^2-1)]/[(x-1)/(x+1)] =[1/(x+1)+(x-1)^2/(x-1)(x+1)]/[(x-1)/(x+1)] =[1/(x+1)+(x-1)/(x+1)]*(x+1)/(x-1) =1/(x+1)*(x+1)/(x-1)+(x-1)/(x+1)*(x+1)/(x-1) =1/(x-1)+1 =(1+x-1)/(x-1) =x/(x-1) =3/(3-1) =3/2

最后一项是分子是x+1 还是1?

答: x²-2x-2=0 (x-1)²=3 x=1±√3 (x-1)²-(x+3)(x-3)+(x+3)(x-1) =x²-2x+1-(x²-9)+x²+2x-3 =x²+7 =(x-1)²+2x+6 =3+2x+6 =9+2x =9+2*(1±√3) =11±2√3

网站首页 | 网站地图
All rights reserved Powered by www.ldcf.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com