先化简,再求值:(x-x 1分之3x)
来源:学生作业帮助网 编辑:作业帮 时间:2024/10/01 05:34:35
原式=(x+4)(x-4)分之(x-4)²=(x+4)分之(x-4)=(5+4)分之(5-4)=9分之1
解x/(x+2)-(x²+2x+1)/(x+2)÷(x²-1)/(x-1)=x/(x+2)-(x+1)²/(x+2)÷(x-1)(x+1)/(x-1)=x/(x+2)-(
[x/(x-2)-x/(x+2)]÷[4x/(x-2)]=[x(x+2)-x(x-2)]/[(x-2)(x+2)]×[(x-2)/4x]=4x/[(x-2)(x+2)]×[(x-2)/4x]=1/(x
原式=[3x(x+1)-x(x-1)/x^2-1]×(x^2-1/2x)上面化到最后=[2x(x+2)/x^2-1]×x^2-1/2x=x+2当x=3时,原式=-3+2=-1(在键盘上打这个好辛苦啊~
x+2分之x-x+2分之x平方+2x+1除以x-1分之x平方-1=[x/(x+2)-(x²+2x+1)/(x+2)]÷(x²-1)/(x-1)=[(x-x²-2x-1)/
=x/(x-1)-x/(x+1)×(1-x)/2x=x/(x-1)+(x-1)/2(x+1)=[2x(x+1)+(x-1)²]/2(x-1)(x+1)=(3x²+1)/2(x
x/(x-3)-3x/(x^2-3x)-3/x通分得=x^2/(x^2-3x)-3x/(x^2-3x)-3*(x-3)/(x^2-3x)=(x^2-3x-3x+9)/(x^2-3x)=(x-3)(x-
(x-1分之x平方-1-x分之2x)除以x-1分之x,其中x=根号3+1=[x²/(x-1)+2x/(x-1)]÷x/(x-1)=x(x+2)/(x-1)*(x-1)/x=x+2其中x=根号
你写的看不懂分子分母的代数式用括号括起来否则分不出来先通分【((x-2)(x+2)-x(x-1))/x(x+2)(x+2)】(x+2)/(x-4)=(x-4)/x(x+2)(x-4)=1/x(x+2)
(1+1/(x-1))÷x/(x²-1)=x/(x-1)÷x/(x+1)(x-1)=x/(x-1)×(x+1)(x-1)/x=x+1代入可得结果等于-1
(X+3)的平方-X的平方=X的平方+6X+9-X的平方=6X+9=6*5/4+9=7.5+9=16.5再问:貌似不是再答:怎么叫貌似不是?(X+3)的平方就是X的平方+6X+9.减去X的平方就是6X
1、(x-3分之2x-x+3分之x)乘x分之x平方-9=[2X(X+3)-X(X-3)]/[(X-3)(X+3)]*(X+3)(X-3)/X=[2X^2+6X-X^2+3X]/X=X+9当X=1时,原
(x-1分之3x-x+1分之x)*x分之x的平方-1=[3x(x+1)-x(x-1)]/x=3(x+1)-(x-1)=3x+3-x+1=2x+4=2√2-4+4=2√2再问:确定么再答:确定啊,楼下也
原式=(x-1)(x+1)/(x+2)*(x+2)/x-1=x+1然后代入数值即可很高兴为您解答,【学习宝典】团队为您答题.请点击下面的【选为满意回答】按钮,
[3x/(x-1)-x/(x+1)]×(x²-1)/x=x[3(x+1)-(x-1)]/(x²-1)×(x²-1)/x=2x+4当x=√2-2时,原式=2x+4=2√2
原式=[2x(x+2)-x(x-2)]/(x²-4)+x/(x²-4)=(x²+7x)/(x²-4)=[x(x+7)]/[(x+2)(x-2)]代入x=5原式=
=(x+1)/((2*x+1+x^2)/x)=(x+1)/((x+1)^2/x)=(x+1)*x/(x+1)^2=x/(x+1)代入x=-3/2得到:原式=3
原式=(x+2)(x+3)x+3•x−3(x+2)(x−2)−1=x−3x−2−x−2x−2=−1x−2;当x=3时,原式=−13−2=2+3.
(x²-1分之x-3)÷(x²+2x+1分之x²-2x-3)-(x+1分之1)=(x-3)/(x+1)(x-1)×(x+1)²/(x-3)(x+1)-1/(x+