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2500 x 6x解方程

2500+x=6x=2500+x-x=6x-x=2500=5x除以5=5x除以5=2500除以5 x=500

2500+x=6x 解:2500+x-x=6x-x 5x =2500 5x÷5 =2500÷5 x=500

5x=2500 x=500

2500=6x-x2500=5xX=2500除以5X=500

2500+X=6X5X=2500X=500

x-6x+5=0 (x-5)(x-1)=0 x1=5,x2=1; x-6x+9-9+5=0(x-3)=4 两边开方: x-3=±2, x1=5,x2=1; x={6±v√[(-6)-4*5]}/2=3±2 x1=3+2=5, x2=3-2=1

400x=(5/6x-4)X500 400x=2500/6x-2000 2400x=2500x-12000 100x=12000 x=120

1、1.4*(2500%-x)-60%x=15 1.4*(25-x)-0.6x=15 35-1.4x-0.6x=152x=20x=102、9(300-x)-1.8x=2600 2700-9x-1.8x=260010.8x=100x=1000/108x=250/273、5x+10(54-x)=390

=(40+x)*2000=100000 80000+2000x=100000 2000x=20000 x=10

400-x=300-(2500-x)400-300=x-(2500-x)(400+300)(400-300)=[x+(2500-x)][x-(2500-x)]700*100=2500(2x-2500)2x-2500=700*100÷25002x-2500=282x=2500+282x=2528x=1264

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