先化简再求值x 3分之x
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原式=3x3-(x3+6x2-7x)-2x3+6x2+8x,=3x3-x3-6x2+7x-2x3+6x2+8x,=15x,当x=-1时,原式=15x=15×(-1)=-15.
题目有误吧(x-x)x-1分之4(x-x)+(x-2)再问:(x方-x)(x-2)方再答:
原式=3x3-x3-2x3-6x2+6x2+7x+4x=15x,当x=13时,原式=15×13=-5.
8-2x分之x的平方-16=[(x+4)(x-4)]/[(-2)(x-4)]=-(x+4)/2把x=-2代入上式得:-1
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/x)/((x²-2x+1)/x)=((x²-1)/x)/((x-1)²/x)=(x+1)(x-1)/(x-1)²=(x+1)/(x-1)=6/4=3/
小括号内先通分:分母为x平方-4,分子为3x平方+6x,另一个是x平方-2x化简:{x²-4分之2x²+8x}÷x²-4分之2x结果=x+4
【先化简再求值】(x-1)分之x÷【(1-x分之1)-1-x】=(x-1)分之x÷(x^2/(1-x))=-1/xx=1时,原式无意义,x=2时,原式=-1/2,x=0时,原式无意义【选择题】下列约分
=(x+1)(x-1)/x÷(x-2x+1)/x=(x+1)(x-1)/x×[-x/(x-1)==x+1当x=√2时原式=√2+1再问:对不起,是我没说明白x²-1÷(1-x分之2x-1)是
(x+y)/[1/(x^2+y^2)]/(x^4-y^4)=(x+y)(x^2+y^2)/[(x^2-y^2)(x^2+y^2)]=(x+y)/(x^2-y^2)=1/(x-y)=1/(8-11)=-
答案是不是二分之X+2的平方—X的平方之一最后是5+2倍的根下2
分子分母同乘以4.再一化简
(x+1)÷[2+x分之(1+x²)]=(x+1)÷[x分之(2x+1+x²)]=(x+1)÷[x分之(x+1)²]=(x+1)·[(x+1)²分之x]=(x+
原式=x^2/(x-1)+1/(1-x)=(x^2-1)/(x-1)=(x+1)(x-1)/(x-1)=x+1x=-3/2原式=-3/2+1=-1/2如果有疑问请点【评论】或者【追问】再问:-a分之1
原式=-[(x-3)/(x-2)]÷{[(x+2)(x-2)-5]/(x-2)]=-[(x-3)/(x-2)]÷[(x²-9)/(x-2)]=-(x-3)/(x+3)(x-3)=-1/(x+
(x+3)/(x²-9)+3/(x-3)=(x+3)/(x-3)(x+3)+3/(x-3)=1/(x-3)+3/(x-3)=4/(x-3)代入x=-1/2原式=4/(-1/2-3)=4/(-
原式=2x3+4x-2x2-x-3x2+2x3=4x3-5x2+3x,当x=-2时,原式=-32-20-6=-58.
(x-2-x+2分之5)÷2x+4分之x-3=(x-2-x+5/2)÷2x+x/4-3=1/2÷2x+x/4-3=1/4x+x/4-3