方程x(60-3x)=S
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x+80÷(x-60)=3x+80=3(x-60)x+80=3x-1802x=260x=130答.
1.x+60%x=421.6x=42x=26.252.x-25%x=180.75x=18x=243.3x+20%x=483.2x=48x=1.25纯手打
4x=60x=15别是刷分饿
(1)3x-60%x=288, 2.4x=288, &nbs
3x+0.6x=43.6x=4x=9分之10
3.6x=108/25,3.6x=4.32,x=1.2
3x-60=x+602x=120x=60
72%x-60%x=24x-3分之1x=121整理成6x-5x=2003分之2x=121x=200x=181.5
x^3-x^2-2x=0x(x^2-x-2)=0x(x-2)(x+1)=0x=0或x=-1或x=2
x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)x/(x-2)=2x/(x-3)+(1-x)/(x-2)(x-3)x(x-3)/(x-2)(x-3)=2x(x-2)/(x-2)(x-3)
3x+60%x=183x+0.6x=183.6x=18x=5
0.75x-0.6x=2.30.15x=2.33x/20=23/10x=46/3
2/3*x-0.6*x=602x-1.8x=180x=900
x-40=3x-180140=2xx=70
3x-x=602x=60x=30
两边除以6得(20-x)(20-x)=100(20-x)²=100∴20-x=1020-x=-10∴x=10或x=30
x/50-x/60=3-2(1/50-1/60)x=1(1/300)x=1x=1÷1/300x=300
3x-60=x+603x-x=60+602x=120x=60
x-3/4x=60*2/31/4x=40x=160