三角形ABC a=根号3,b=2,sinA=3\4 求B我觉得B不能为120,如果为120,A=60时,sina=根号3）\260不符号内角和定理,可答案说60 和120

三角形ABC a=根号3,b=2,sinA=3\4 求B我觉得B不能为120,如果为120,A=60时,sina=根号3）\260不符号内角和定理,可答案说60 和120
三角形ABC a=根号3,b=2,sinA=3\4 求B
我觉得B不能为120,如果为120,A=60时,sina=根号3）\260不符号内角和定理,可答案说60 和120

三角形ABC a=根号3,b=2,sinA=3\4 求B我觉得B不能为120,如果为120,A=60时,sina=根号3）\260不符号内角和定理,可答案说60 和120
B为120度,A就是60度,A+B就等于180度了,那C角呢?显然答案错了

sw

正弦定理a/sinA=b/sinB得sinB=根号3/2，所以B=60或120

在第一 二象限sin都是正啊

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