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一个三角形一边长为a+b,另一边长比这条边大b,第三边长比这条边小a—b.(1)求这个三角形的周长;(2)若a=5,b=3,求三角形周长的值.
一个三角形一边长为a+b,另一边长比这条边大b,第三边长比这条边小a—b.(1)求这个三角形的周长;(2)若a=5,b=3,求三角形周长的值.
发布时间:2020-08-07 09:27:10
一个三角形一边长为a+b,另一边长比这条边大b,第三边长比这条边小a—b.(1)求这个三角形的周长;(2)若a=5,b=3,求三角形周长的值.
网友回答
(1)三角形的周长为a+b+a+2b+2b=2a+5b(2)25解析(1)用代数式分别表示出三边的长再相加,即可得三角形的周长.
(2)把a=5,b=3,代入三角形周长的式子,计算出周长的值.
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已知⊿ABC的三个内角A、B、C的对边分别为a、b、c,且b2+c2=a2+bc,求:(1)2sinBcosC-sin(B-C)的值;(2)若a=2,求⊿ABC周长的
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