求八年级下册数学计算题，要有解答过程 初二数学，求计算题解答过程，急！！
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对角相乘
4x=x+3
3x=3
x=1
分式方程要检验
经检验，x=1是方程的解
x/(x+1)=2x/(3x+3)+1
两边乘3(x+1)
3x=2x+(3x+3)
3x=5x+3
2x=-3
x=-3/2
分式方程要检验
经检验，x=-3/2是方程的解
2/x-1=4/x^2-1
两边乘(x+1)(x-1)
2(x+1)=4
2x+2=4
2x=2
x=1
分式方程要检验
经检验，x=1使分母为0，是增根，舍去
所以原方程无解
5/x^2+x - 1/x^2-x=0
两边乘x(x+1)(x-1)
5(x-1)-(x+1)=0
5x-5-x-1=0
4x=6
x=3/2
分式方程要检验
经检验，x=3/2是方程的解
5x/(3x-4)=1/(4-3x)-2
乘3x-4
5x=-1-2(3x-4)=-1-6x+8
11x=7
x=7/11
分式方程要检验
经检验
x=7/11是方程的解
1/(x+2) + 1/(x+7) = 1/(x+3) + 1/(x+6)
通分
(x+7+x+2)/(x+2)(x+7)=(x+6+x+3)/(x+3)(x+6)
(2x+9)/(x^2-9x+14)-(2x+9)/(x^2+9x+18)=0
(2x+9)[1/(x^2-9x+14)-1/(x^2+9x+18)]=0
因为x^2-9x+14不等于x^2+9x+18
所以1/(x^2-9x+14)-1/(x^2+9x+18)不等于0
所以2x+9=0
x=-9/2
分式方程要检验
经检验
x=-9/2是方程的解
7/(x^2+x)+1/(x^2-x)=6/(x^2-1)
两边同乘x(x+1)(x-1)
7(x-1)+(x+1)=6x
8x-6=6x
2x=6
x=3
分式方程要检验
经检验，x=3是方程的解
化简求值。[X-1-（8/X+1）]/[X+3/X+1] 其中X=3-根号2
[X-1-（8/X+1）]/[(X+3)/(X+1)]
={[(X-1)(X+1)-8]/(X+1)}/[(X+3)/(X+1)]
=(X^2-9)/(X+3)
=(X+3)(X-3)/(X+3)
=X-3
=-根号2
8/(4x^2-1)+(2x+3)/(1-2x)=1
8/(4x^2-1)-(2x+3)/(2x-1)=1
8/(4x^2-1)-(2x+3)(2x+1)/(2x-1)(2x+1)=1
[8-(2x+3)(2x+1)]/(4x^2-1)=1
8-(4x^2+8x+3)=(4x^2-1)
8x^2+8x-6=0
4x^2+4x-3=0
(2x+3)(2x-1)=0
x1=-3/2
x2=1/2
代入检验，x=1/2使得分母1-2x和4x^2-1=0。舍去
所以原方程解:x=-3/2
(x+1)/(x+2)+(x+6)/(x+7)=(x+2)/(x+3)+(x+5)/(x+6)
1-1/(x+2)+1-1/(x+7)=1-1/(x+3)+1-1/(x+6)
-1/(x+2)-1/(x+7)=-1/(x+3)-1/(x+6)
1/(x+2)+1/(x+7)=1/(x+3)+1/(x+6)
1/(x+2)-1/(x+3)=1/(x+6)-1/(x+7)
(x+3-(x+2))/(x+2)(x+3)=(x+7-(x+6))/(x+6)(x+7)
1/(x+2)(x+3)=1/(x+6)(x+7)
(x+2)(x+3)=(x+6)(x+7)
x^2+5x+6=x^2+13x+42
8x=-36
x=-9/2
经检验，x=-9/2是方程的根。
(2-x)/(x-3)+1/(3-x)=1
(2-x)/(x-3)-1/(x-3)=1
(2-x-1)/(x-3)=1
1-x=x-3
x=2
分式方程要检验
经检验，x=2是方程的根
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绛旓細x=8 绛旓細姣忎釜鐢茬鍟嗗搧杩涗环涓8鍏冿紝鍒欎箼绉嶅晢鍝佽繘浠蜂负10鍏冦傦紙2锛夎璐繘涔欑鍟嗗搧y涓紝鍒欒喘杩涚敳绉嶅晢鍝侊紙3y-5锛変釜锛庣敱棰樻剰寰楋細3y-5+y鈮95 锛12-8)锛3y-5)+(15-10)y锛375 瑙ｅ緱锛23锛測鈮25 鈭祔涓烘暣鏁扳埓y=24鎴25锛庘埓鍏辨湁2绉嶆柟妗堬紟鏂规涓锛氳喘杩涚敳绉嶅晢鍝67涓紝涔欑鍟嗗搧24涓紱鏂规浜...
绛旓細瑙ｏ細璁炬湁x浜猴紝鏈鍚庝竴涓汉鍒嗗埌a涓 5x+12=8锛坸-1锛+a 5x+20=8x+a 3x+a=20 鍙0<a<8 鍒檃鍙彇2锛5锛寈鍙彇6鎴5 鏈5涓汉37涓嫻鏋滄垨6涓汉42涓嫻鏋
绛旓細1銆侊紙1锛夊師寮=鈭10 锛2锛 鍘熷紡=鈭36=6 锛3锛 鍘熷紡=2鈭3 锛4锛 鍘熷紡=鈭4=2 2銆侊紙1锛夊師寮=7*11=77 锛2锛 鍘熷紡=15 锛3锛 鍘熷紡=2鈭歽 锛4锛 鍘熷紡=4|bc|鈭歛c 3銆侀潰绉=鈭10*2鈭2=4鈭5
绛旓細瑙ｏ細锛1锛夎y-1=kx锛屼唬鍏=-1,y=3 寰3-1=-k,k=-2 鈭磞-1=-2x 鍗硑=-2x+1 锛2锛夊綋y=-7鏃 -7=-2x+1 瑙ｅ緱x=4
