x分之x-1-x 1分之x-2 怎么化简啊
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/19 01:09:02
![x分之x-1-x 1分之x-2 怎么化简啊](/uploads/image/f/900831-39-1.jpg?t=x%E5%88%86%E4%B9%8Bx-1-x+1%E5%88%86%E4%B9%8Bx-2+%E6%80%8E%E4%B9%88%E5%8C%96%E7%AE%80%E5%95%8A)
原式得:1/(x-3)=2-x/(x-3)两边同时乘以x-3得:2x-6-x=1x-6=1x=7
X1+X2=-B/A=2X1*X2=C/A=1/2求得X1=1+根号2或者X1=1-根号2从而求出X2的值X1/X2+X2/X1=(X1*X1+X2*X2)/(X1X2)=6
原式=[(1-1分之x+5)-(1-1分之x+4))+(1-1分之x+3)-(1-1分之x+2)]*[(x+3)(x+5)]\(x^2+7x+13)=[(1分之x+2)-(1分之x+3)+(1分之x+
=2x/x²-(2x-1)/x²=(2x-2x+1)/x²=1/x²
(x/2)+(x/6)+(x/12)+(x/20)+(x/30)+(x/42)=x/(1*2)+x/(2*3)+x/(3*4)+x/(4*5)+x/(5*6)+x/(6*7)=x-x/2+x/2-x/
这个是用等比、等差做的再问:根据n(n+1)分之1=n分之1-n+1分之1的规律化简再答:对--到最后--中间的都消去。只省最前和最后的---自己看看高中书中的这张-我也好久没看了,快记不得了-再问:
(x-3)分之x-(x^2-3x)分之(x+6)+x分之1等于几?=x²/x(x-3)-(x+6)/x(x-3)+(x-3)/x(x-3)=(x²-x-6+x-3)/x(x-3)=
=[(x+2)/x(x-2)-(x-1)/(x-2)²]×x/(4-x)=[(x²-4-x²+4)/x(x-2)²]×x/(4-x)=1/(x-2)²
2x平方-5x-1=0X平方-5/2X-1/2=0X平方-5/2X=1/2X平方-5/2X+5/4的平方=1/2+5/4的平方(X-5/4)平方=33/16X-5/4=正负根号33/4X=正负根号33
=x/(x+2)(x-2)-(x-2)/(x+2)(x-2)=[x-(x-2)]/(x+2)(x-2)=2/(x²-4)
x/4+0.75x=1/82x+0.75=12x=0.25x=0.1254(x+0.2)=1.24x=1.2-0.84x=0.4x=0.15x-1/3=2/315x-1=215x=3x=0.2可以重新
x+2/x=c+2/c~x1=c,x2=2/c;x+2/(x-1)=a+2/(a-1);(x-1)+2/(x-1)=(a-1)+2/(a-1);x1-1=a-1;x2-1=2/(a-1);x1=a;x
再问:再答:
(x+1)/(x+2)-1/(x+7)=(x+2)/(x+3)-1/(X+6)(X+2-1)/(X+2)-1/(X+7)=(X+3-1)/(X+3)-1/(X+6)1-1/(X+2)-1/(X+7)=
2x/(x+1)+1/x=2(2x^2+x+1)/x(x+1)=22x^2+x+1=2x(x+1)2x^2+x+1=2x^2+2xx=1
2√2-2或-2√2-2
原式=[(x+2)/x(x-2)-(x-1)/(x-2)²]÷(4-x)/x=[(x+2)(x-2)/x(x-2)²-x(x-1)/x(x-2)²]÷(4-x)/x=[(
x1+x2=4x1x2=-1(x1+x2)^2/(1/x1+1/x2)=(x1+x2)^2*x1x2/(x1+x2)=x1x2*(x1+x2)=-4