解方程:75%X+25%XX[800-X]=8000X45%
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解方程:75%X+25%XX[800-X]=8000X45%解方程:75%X+25%XX[800-X]=8000X45%解方程:75%X+25%XX[800-X]=8000X45%75%X+25%XX
解方程:75%X+25%XX[800-X]=8000X45%
解方程:75%X+25%XX[800-X]=8000X45%
解方程:75%X+25%XX[800-X]=8000X45%
75%X+25%XX[800-X]=8000X45%
75x+25x×(800-x)=8000×45
x+x×(800-x)=320×45
x+800x-x^2=14400
x^2-801x+14400=0
x=(801±√801^2-4×1×14400)/2×1
x=(801±√584001)/2
解方程:75%X+25%XX[800-X]=8000X45%
解方程:75%X+25%XX[800-X]=8000X45%
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