{"problem":{"name":"计算并联电阻的阻值","description":{"content":"对于阻值为 $r_1$ 和 $r_2$ 的电阻，其并联电阻阻值公式计算如下： $$R=\\dfrac{1}{\\dfrac{1}{r_1}+\\dfrac{1}{r_2}}$$ 输入实数 $r_1,r_2$。输出并联之后的阻抗大小，结果保留小数点后 $2$ 位。 ","description_type":"Markdown"},"platform":"Luogu","limit":{"time_limit":1000,"memory_limit":131072},"difficulty":{"LuoguStyle":"P1"},"is_remote":true,"is_sync":true,"sync_url":null,"sign":"LGB2015"},"statements":[{"statement_type":"Markdown","content":"对于阻值为 $r_1$ 和 $r_2$ 的电阻，其并联电阻阻值公式计算如下：\n$$R=\\dfrac{1}{\\dfrac{1}{r_1}+\\dfrac{1}{r_2}}$$\n\n输入实数 $r_1,r_2$。输出并联之后的阻抗大小，结果保留小数点后 $2$ 位。\n\n## Input\n\n两个实数 $r_1,r_2$，以一个空格分开。\n\n## Output\n\n并联之后的阻抗大小，保留小数点后 $2$ 位。\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"LGB2015","tags":["顺序结构"],"sample_group":[["1 2","0.67"]],"created_at":"2026-03-03 11:09:25"}}