(9+r)²=(9-r)²+(r-9)²求解这个方程
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(9+r)²=(9-r)²+(r-9)²求解这个方程
(9+r)²=(9-r)²+(r-9)²求解这个方程
(9+r)²=(9-r)²+(r-9)²求解这个方程
(9+r)²=(9-r)²+(r-9)²
81+18r+r²=81-18r+r²+r²-18r+81
整理得:r²-54r+81=0
配方得:(r-27)²-27²+81=0
(r-27)²=648
r-27=±√648
r=27±18√2
由(9+r)²=(9-r)²+(r-9)²,
(9+r)²=2(9-r)²
(1)9+r=√2(9-r)
9+r=9√2-√2r
r+√2r=9√2-9
(1+√2)r=9(√2-1)
r=9(√2-1)/(√2+1)
r1=9(√2-1)²。
(2)9+r=-√2(9-r)
r2=√(√2+1)²