86 x=7(x-12)
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1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550120x=550x=55/12=4.583
5x/(x²+x-6)+(2x-5)/(x²-x-12)=(7x-10)/(x²-6x+8)5x/(x-2)(x+3)+(2x-5)/(x+3)(x-4)=(7x-10)
(5-2x)/(x^2-x-12)=5x/(x^2+x-6)+(10-7x)/(x^2-6x+8)(5-2x)/(x-4)(x+3)=5x/(x+3)(x-2)+(10-7x)/(x-2)(x-4)分
解方程x=25x/28+9,得3x/28=9,得x=84
86+x=7(x-12)86+x=7x-847x-x=86+846x=150x=25再问:你算术合不合格啊86+84=170再答:哦!、一点小失误原题86+x=7(x-12)86+x=7x-847x-
(x-2)(x-3)+2(x-5)(x+6)-3(x^2-7x+12)=x^2-5x+6+2x^2+2x-60-3x^2+21x-36=18x-90=18*(-5/2)-90=-45-90=-135
这都做不起啊再问:.......●︿●再问:告诉我第一题的做法就行了再答:有x的数字相加,等号右边相加,然后等号右边除以等号左边的数字就求出x了再问:谢谢,我一直对方程的做法不怎么了解。现在懂了。再问
应该是-2x²,不是-3x²3x²-x=1原式=9x^4-3x³+15x³-5x²+3x²-7x+2001=3x²(3x
原式=10x2-15x+14x-21-9x2+18x=x2+17x-21,当x=-12时,原式=14-172-21=-1174.
5x/(x²+x-6)+(2x-5)/(x²-x-12)=(7x-10)/(x²-6x+8)5x/[(x+3)(x-2)]+(2x-5)/[(x-4)(x+3)]=(7x
就这么算啊(x+2)(x-12)+(x+7)(x+8)+(x+5)(x-10)=(x²-10x-24)+(x²+15x+56)+(x²-5x-50)=3x²-1
1/6x+1/12x+1/7x+5+1/2x+4=x2/12x+1/12x+6/12x-12/12x+1/7x=-9-1/4x+1/7x=-9-7x+4x=-9*28-3x=-9*28x=84
原式化简:{(x-3)(x-2)/(x-3)(x-4)}²÷{(x+1)(x+2)/(x-4)(x+2)}²{(x-2)/(x-4)}²÷{(x+1)/(x-4)}
(x²-7x+12)(x²+x+1)>0因为x²+x+1=(x+1/2)²+3/4>0所以(x²-7x+12)>0(x-3)(x-4)>0x>4或x
9x-12x+5x=-3x+5x=2x3x-5x-2+5x+8=-2x+5x-2+8=3x+63x+5+2x+3-7-11x=3x+2x-11x+5+3-7=5x-11x+8-7=-6x+1
再问:лл��
=x^2+10x-24+x^2+15x+56-x^2+5x+50=x^2+30x+82=4+60+82=146其实,不化简,直接代入=14*0+9*10+7*8=0+90+56=146也很简单
(x×x+3x+2)(x×x+7x+12)-24=(x+1)(x+2)(x+3)(x+4)-24=(x+1)(x+4)(x+2)(x+3)-24=(x²+5x+4)(x²+5x+6
原方程变形为:x+1x+2-x+2x+3=x+7x+8-x+8x+9,去分母,得(x+2)(x+3)=(x+8)(x+9),整理,得12x+66=0,解得x=-5.5,经检验,x=-5.5是原方程的解
(x^2+4x)^2+7(x^2+4x)+12=(x^2+4x+3)(x^2+4x+4)=(x+3)(x+1)(x+2)^2