0.4x-0.25(2000-x)=110
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0.4x-0.25(2000-x)=110
0.4x-0.25(2000-x)=110
0.4x-0.25(2000-x)=110
0.4x--500+0.25x=110
0.65x=610
x=610/0.65=12200/13
原式=0.4x-0.25×2000+0.25x=110
=0.4x+0.25x-500=110
=0.65x=610
→x=610÷0.65=12200/13≈938.461538
若1+x+x*x+x*x*x=0,求x+x*x+x*x*x+.+x(2000次幂)
0.4x-0.25(2000-x)=110
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