√(25+r²)=4+√(r²-9)怎么解?
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![√(25+r²)=4+√(r²-9)怎么解?](/uploads/image/z/8128580-68-0.jpg?t=%E2%88%9A%EF%BC%8825%2Br%26%23178%3B%EF%BC%89%3D4%2B%E2%88%9A%EF%BC%88r%26%23178%3B-9%EF%BC%89%E6%80%8E%E4%B9%88%E8%A7%A3%3F)
√(25+r²)=4+√(r²-9)怎么解?
√(25+r²)=4+√(r²-9)怎么解?
√(25+r²)=4+√(r²-9)怎么解?
√(25+r²)=4+√(r²-9) 25+r²=16+8√(r²-9)+r²-9 18=8√(r²-9) 9=4√(r²-9) 81=16(r²-9) (r²-9)=81/16 r²=225/16 r=15/4或r=-15/4 看条件要求是什么了.