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小場地的半徑是5m.設小場地半徑為r.則:小場地面積πr²;大場地面積為π(r+5)²;為一元二次方程求r值4πr²;=π(r+5)²;4r²;=r²;+10r+253r²;-10r-25=0(3r+5)(r-5)=0則r=5或者r=-5/3,因…
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