求解一元二次方程。
(1000-x)(30-(x-100000)/5000)-10000(30-(x-100000)/5000)-5000((x-100000)/5000)=2750000...
(1000-x)(30-(x-100000)/5000)-10000(30-(x-100000)/5000)-5000((x-100000)/5000)=2750000
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2个回答
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(1000-x)[150000-(x-100000)]-10000[150000-x+100000]-5000(x-100000)=13750000000
150000000-150000x+(x-1000)(x-100000)-2500000000+10000x-5000x+500000000=13750000000
x²-251000x+100000000-15600000000+5000x=0
x²-246000x-15500000000=0
此时用求根公式
x=(246000±√)/2=1000(123±√30629)
x1=1000(123+√30629)
x2=1000(123-√30629)
150000000-150000x+(x-1000)(x-100000)-2500000000+10000x-5000x+500000000=13750000000
x²-251000x+100000000-15600000000+5000x=0
x²-246000x-15500000000=0
此时用求根公式
x=(246000±√)/2=1000(123±√30629)
x1=1000(123+√30629)
x2=1000(123-√30629)
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