作业帮求锐角a!2sin²a+3sina-2=01求锐角a:2sin²a+3sina-2=02已知△ABC是锐角三角形,证明：（1）S△ABC=（1/2）absinC ,(2)a/sinA=b/sinB=c/sinC
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/11 20:14:39
x){ /OJT4*SS64N6ul
*0z}K Mlz';:ӽt^o|6Yt Qi F9+hi&I 6D9$t%XAUܽv6C%\
@ٖ9O;f>|]Ó J⌴KF%%FP Uה$ف| :
求锐角a!2sin²a+3sina-2=01求锐角a:2sin²a+3sina-2=02已知△ABC是锐角三角形,证明：（1）S△ABC=（1/2）absinC ,(2)a/sinA=b/sinB=c/sinC
求锐角a!2sin²a+3sina-2=0
1求锐角a:2sin²a+3sina-2=0
2已知△ABC是锐角三角形,证明：（1）S△ABC=（1/2）absinC ,(2)a/sinA=b/sinB=c/sinC
求锐角a!2sin²a+3sina-2=01求锐角a:2sin²a+3sina-2=02已知△ABC是锐角三角形,证明：（1）S△ABC=（1/2）absinC ,(2)a/sinA=b/sinB=c/sinC
1 sina=t
则化简为2t^2+3t-2=0
所以(2t-1)(t+2)=0
因为|t|