(4+r)²+(6+r)² (4+r)²+(6+r)²=10²

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/15 18:55:19

(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