4x减20=3x+15
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![4x减20=3x+15](/uploads/image/f/327224-56-4.jpg?t=4x%E5%87%8F20%EF%BC%9D3x%2B15)
再答:满意回答呢。再问:再问:太给力了,你的回答完美解决了我的问题!再答:再问:再答:全化分式转右变去算x不动。加油我写作业去了
是这样的:x^5+x^4=x^3(x^2+x)=(x^2+x)[(x^3-1)+1]=(x^2+x)(x^3-1)+x^2+x=[x(x+1)(x-1)](x^2+x+1)+x^2+x=(x^3-x)
再答:采纳吧再问:我们没学-30这样的再答:好吧,我重写一份再答:答案是对的再答:先采纳一下我再答: 再答:可以了么再答:给你写了这么多也不采纳?
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550120x=550x=55/12=4.583
[(X+3)/(X^2-4)-(-X)/(6-X-X^2)]/[1-(X^2-3X-15)/(X^2+X-6)]={(x+3)/[(x+2)(x-2)]-x/[(x+2)(x-3)]}/[(4x+9)
1.4X-0.5X=1.753.5X=1.75X=0.52.X除0.63=12X=12*0.63X=7.563.6X=20X=3分之104.2X=3.2X=1.6
原式=4x-60x+3x^2=5x-140x+7x^24x^2-79x=0x=0或者x=7/4
1/(x+2)-(x^2-4x+4)/(x^2-3x)÷(x^2-4)/(x-3)=1/(x+2)-(x-2)^2/(x-3)x÷(x-2)(x+2)/(x-3)=1/(x+2)-(x-2)^2/(x
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+
再答:望采纳,谢谢。
6x=12x=22x=12x=6x=43+x=9x=63x-4-2x=1x=524-3x+12=x4x=36x=96x-4+x=177x=21x=3
15-(7-4x)=2x+(5-2x)2x-3x-2=27分之10x-3分之17-0.2x=115-7+4x=2x+5-2x-x-2=230x-119-4.2x=218+4x=5-x=425.8x=1
设x1=4-√3,x2=4+√3,是方程X^2-8X+13=0的两根所以X1^2-8X1+15=2X^4-6X^3-2X^2+18X+23=(X+1)^2*(X^2-8X+13)+10=10所以原式=
[x+1-15/(x-1)]÷[(x^2-4x)/(x^2-x)]=[(x^2-1-15)/(x-1)]÷[x(x-4)/x(x-1)]=[(x^2-16)/(x-1)]÷[(x-4)/(x-1)]=
方程的两边同乘x,得x|x|-4=3|x|,当x≥0时,x2-3x-4=0解得x=-1或4.∴x=4,当x<0时,x2-3x+4=0此方程无解,检验:把x=4代入x=4≠0.∴原方程的解为:x=4.
(4x+20)(x的平方-6x+9)/(3x-x的平方)(x的平方+2x-15)=4(x+5)(x-3)²/3(3-x)(x-3)(x+5)=-4/3
3(x-7)+5(x-4)=15?3x-21+5x-20=158x=15+41x=56/8=74x-3(20-x)=-44x-60+3x=-47x=-4+60x=56/7=8
4x-60x+3x*x=5x-140x+7x*x4x*x-79x=0x(4x-79)=0x=0或x=79/4
不知道你^这个符号什么意思暂且当成平方做吧x^2+4x+3=(x+1)(x+3)(2x-x)^2=x^2x^2+x=x(x+1)x^2+x-6=(x+3)(x-2)约分:得x/(x-2)再问:题目炒错
/>(x+2)/(x+1)-(x+3)/(x+2)-(x+4)/(x+3)+(x+5)/(x+4)=1+1/(x+1)-1-1/(x+2)-1-1/(x+3)+1+1/(x+4)=1/(x+1)-1/