0.55x×0.35×(120-x)=58怎么解
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解:0.55x*0.35(120-x)=58
0.1925x(120-x)=58
x(120-x)=58/0.1925
x(120-x)=301.29
120x-x^2=301.29
x^2-120x+301.29=0
120^2-4x301.29=13194.84
x=(120+-13194.84^1/2)/2
x=(120+-114.86)/2
x=60+-57.43
x1=60+57.43=117.43
x2=60-57.43=2.57
答:原一元二次方程的解是x1=117.43,x2=2.57.
0.1925x(120-x)=58
x(120-x)=58/0.1925
x(120-x)=301.29
120x-x^2=301.29
x^2-120x+301.29=0
120^2-4x301.29=13194.84
x=(120+-13194.84^1/2)/2
x=(120+-114.86)/2
x=60+-57.43
x1=60+57.43=117.43
x2=60-57.43=2.57
答:原一元二次方程的解是x1=117.43,x2=2.57.
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