(4+r)²+(6+r)² (4+r)²+(6+r)²=10²
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(4+r)²+(6+r)² (4+r)²+(6+r)²=10²
(4+r)²+(6+r)²
(4+r)²+(6+r)²=10²
(4+r)²+(6+r)² (4+r)²+(6+r)²=10²
(4+r)²+(6+r)²=16+8r+r²+36+12r+r²=2r²+20r+52=100
r²+10r-24=0 (r-2)(r+12)=0
所以r=2 r=-12
(4+r)²+(6+r)²=16+8r+r2+36+12r+r2=2r2+20r+52