解2r+3.14*r=15.42
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解2r+3.14*r=15.42解2r+3.14*r=15.42解2r+3.14*r=15.422r+3.14*r=15.425.14r=15.42r=35.14*r=15.42；r=15.42/5.
解2r+3.14*r=15.42
解2r+3.14*r=15.42
解2r+3.14*r=15.42
2r+3.14*r=15.42
5.14r = 15.42
r = 3
5.14*r=15.42；
r=15.42/5.14
r=3;
r=3
2r+3.14*r=15.42
5.14r = 15.42
r = 15.42/5.14
r = 3