解方程x+2分之x+1-x+3分之x+2=x+6分之x+5-x+7分之x+6

如题所述

你要说的是:(x+2)分之(x+1
)减去(
x+3)分之(x+2)
等于
(x+7)分之1
减去(
x+6)分之1
解方程
解:(x+1)/(x+2)-(x+2)/(x+3)=1/(x+7)-1/(x+6)
通分得[(x+1)(x+3)-
(x+2)(x+2)]/
(x+2)(x+3)=[(x+6)-(x+7)]/
(x+6)(x+7)
计算合并得-1/(x²+5x+6)=-13/(x²+13x+42)
-x²-13x-42=
-13x²-65x-78移项得12x²+52x+36=0化得3x²+13x+9=0
解得x1=(-13+√61)/6,x2=(-13-√61)/6
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第1个回答  2020-01-11
x+2分之x+1-x+3分之x+2=x+6分之x+5-x+7分之x+6
1-(x+2)分之1
-[1-(x+3)分之1]=1-(x+6)分之1-【1-(x+7)分之1】
从而
(x+3)分之1-(x+2)分之1=(x+7)分之1-(x+6)分之1
(x+2)(x+3)分之-1=(x+7)(x+6)分之-1
所以
(x+2)(x+3)=(x+7)(x+6)
x²+5x+6=x²+13x+42
5x+6=13x+42
8x=-36
x=-9/2
经检验x=-9/2是方程的根。

解方程x+2分之x+1-x+3分之x+2=x+6分之x+5-x+7分之x+6
解:通分,得到 (x+2)(x+3)=(x+6)(x+7)5x+6=13x+42 8x=-36 x=-9\/2

解方程:x+2\/x+1-x+3\/x+2=x+6\/x+5-x+7\/x+6
解:通分化简得到 (x+1)(x+2)=(x+5)(x+6)3x+2=11x+30 8x=-28 x=-7\/2

解方程:x+2分之x+1+x+7分之x+6=x+3分之x+2+x+6分之x+5
==>x\/2+x\/7+7 = (x\/3+x\/6)+7 ==>x\/7 = 0 ==>x=0

解方程x+2分之x+1+x+7分之x+6=x+3分之x+2+x+6分之x+5
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解方程:(x+1\/x+2)+(x+6\/x+7)=(x+2\/x+3)+(x+5\/x+6)
解:原方程化为1-1 x+2 +1- 1 x+7 =1- 1 x+3 - 1 x+6 = 1 x+2 - 1 x+3即1 (x+6)(x+7)= 1 (x+2)(x+3),所以(x+6)(x+7)=(x+2)(x+3).x=-9 2 .经检验x=-9 2 是方程的根

解方程 x+1分之x+2-x+2分之x+3=x+3分之x+4-x+4分之x+5
(x+2)\/(x+1)-(x+3)\/(x+2)=(x+4)\/(x+3)-(x+5)(x+4)左边=1+1\/(x+1)-1-1\/(x+2)=1\/(x+1)-1\/(x+2)=1\/(x+1)(x+2)右边=1+1\/(x+3)-1-1\/(x+4)=1\/(x+3)-1\/(x+4)=1\/(x+3)(x+4)1\/(x+1)(x+2)=1\/(x+3)(x+4)即(x+1)(x+2)=(x+3...

解方程x+1\/x+2+x+6\/x+7=x+2\/x+3+x+5\/x+6
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+6)-1\/(x+7)=1\/(x+2)-1\/(x+3)1\/(x+6)(x+7)=1\/(x+2)(x+3)(x+6)(x+7)=(x+2)(x+3)13x+42=5x+6 8x=-36 x=-4.5 经检验x=-4.5是方程的...

x+1分之x+2减去x+3分之x+4=x+5分之x+6减去X+7分之x+8 (解方程)
x+1分之x+2减去x+3分之x+4=x+5分之x+6减去X+7分之x+8 方程两边分别通分,得 [(x+2)(x+3)-(x+1)(x+4)]\/[(x+1)(x+3)]=[(x+6)(x+7)-(x+8)(x+5)]\/[(x+5)(x+7)]2\/[(x+1)(x+3)]=2\/[(x+5)(x+7)]则(x+5)(x+7)=(x+1)(x+3)x²+12...

分式方程(x+1)\/(x+2)+(x+6)\/(x+7)=(x+2)\/(x+3)+(x+5)\/(x+
1-1\/(x+2)+1-1\/(x+7)=1-1\/(x+3)+1-1\/(x+6)即: 1\/(x+2)+1\/(x+7)=1\/(x+3)+1\/(x+6)通分: (2x+9)\/(x+2)(x+7)=(2x+9)\/(x+3)(x+6)得:2x+9=0, 或(x+2)(x+7)=(x+3)(x+6)前者得x=-4.5, 后者无解 经检验,x=-4.5为原方程的解。

解方程数学问题x+1\/x+2+x+2\/x+3=x+3\/x+4+x+4\/x+5
解:1-1\/﹙x+2﹚+1-1\/﹙x+3﹚=1-1\/﹙x+4﹚+1-1\/﹙x+5﹚1\/﹙x+2﹚+1\/﹙x+3﹚=1\/﹙x+4﹚+1\/﹙x+5﹚1\/﹙x+2﹚-1\/﹙x+4﹚=1\/﹙x+5﹚-1\/﹙x+3﹚2\/﹙x²+6x+8﹚=﹣2\/﹙x²+8x+15﹚x²+8x+15=﹣x²-6x-...

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