(a-c)²=b²-ac则∠B=
来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/17 23:46:37
(a-c)²=b²-ac则∠B=(a-c)²=b²-ac则∠B=(a-c)²=b²-ac则∠B=(a-c)²=b²-ac
(a-c)²=b²-ac则∠B=
(a-c)²=b²-ac则∠B=
(a-c)²=b²-ac则∠B=
(a-c)²=b²-ac
a^2+c^2-2ac=b^2-ac
a^2+c^2-b^2=ac
cos∠B=(a^2+c^2-b^2)/(2ac)=1/2
∠B=60°