作业帮(r1+r2)^2-(1.5-r1-r2)^2-(1-r1-r2)^2=0
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(r1+r2)^2-(1.5-r1-r2)^2-(1-r1-r2)^2=0
(r1+r2)^2-(1.5-r1-r2)^2-(1-r1-r2)^2=0
(r1+r2)^2-(1.5-r1-r2)^2-(1-r1-r2)^2=0
(r1+r2)^2-(1.5-r1-r2)^2-(1-r1-r2)^2=0
(r1+r2)^2-1.5^2+2*1.5(r1+r2)-(r1+r2)^2-1+2(r1+r2)-(r1+r2)^2=0
-3.25+5(r1+r2)-(r1+r2)^2=0
(r1+r2)^2-5(r1+r2)+3.25=0
4(r1+r2)^2-20(r1+r2)+13=0
(r1+r2)^2-(1.5-r1-r2)^2-(1-r1-r2)^2=0
R1R2/R1+R2 R1R2/R1+R2
R1+R2+R3?
R1R2/R1+R2=?
[U/（R1+R2）][U/（R1+R2）]*R2可化简为U*U*R2/(R1+R2)?
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我只求得了,r1+r2=2 />
F=GMm/(R1+R2)^2
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R1：R5=1:6 ,R2:R5=1:2, 那么 R1:R2=?