(1-25%)X-15=(1-2 5)X 15X=200怎么解

x加30%x=521.3x=52x=52×1.3x=40x减40%x=150.6x=15x=15÷0.6x=2550%x加x=31.51.5x=31.5x=31.5÷1.5x=21x减1%x=19.8

25%x+1/4x=13.21/4x+1/4x=13.2(1/4+1/4)x=13.21/2x=13.2x=13.2÷1/2x=26.4

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)

1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550120x=550x=55/12=4.583

25%x=4.75x=4.75/25%x=192x-4=162x=16+42x=20x=20/2x=102分之1x+3分之1x=155/6x=15x=15/5/6x=180.8X（x-0.4）=8x-

X(X^2-6X-9)-X(X^2-8X-15)+2X(3-X)=X^3-6X^2-9X-X^3+8X^2+15X+6X-2X^2=12x带入X=1/3原式=12*1/3=4

x/2（1/1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11)=1x/2*10/11=110x=22x=11/5这回的方法是你想要的了吧

（2x+5)(4x*x-10x+25)=8x(x*x+1)8x^3-20x^2+50x+20x^2-50x+125=8x^3+8x,8x=125,x=125/8或利用立方和公式8x^3+125=8x^

1/[x(x+3)]+1/[(x+3)(x+6)]+.+1/[(x+15)(x+18)]=1/3[1/x-1/(x+3)]+[1/(x+3)-1/(x+6)]+.+[1/(x+15)-1/(x+18)

∵(x^4-4x^2+5x-15)/[(x^2+1)(x-2)]=[(x^4+x²-5x²-5)+(5x-10)]/[(x²+1)(x-2)]=[x²(x&su

x/x(x-1)+2=2x/(x+1)1/(x-1)+2=2x/(x+1)x+1+2(x-1)(x+1)=2x(x-1)x+1+2x²-2-2x²-2x=0-x-1=0-x=1x=

按15%×5%做：(15%×5%)+3.5X=X-10.0075+3.5X=X-13.5X-X=-1-0.00752.5X=-1.0075X=-0.403按15%+5%做：(15%+5%)+3.5X=

 再答：采纳哟

1*x=3*(1/6x+25)x=1/2x+751/2x=75x=150

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15+1=3x-x16=2xx=16/2x=8

.3x+1=15-x3x+x=15-14x=14x=14/4x=7/2.

x+15%x=3.22,0.15x=3.22x=322/151/2x-25%x=10,0.5x-0.25x=100.25x=10x=40x*(1-37.7%)=5/80.623x=0.625x=1,4

25%x+(1-25%)*20%x+6=x0.25x+0.15x+6=x0.4x+6=xx-0.4x=60.6x=6x=10

x²+x²+2x+1=25x²+x-12=0(x+4)(x-3)=0∴x=-4x=3再问：请问：12怎么来的？再答：x²+x²+2x+1=252x&#