in triangle abc a=12 b=16 and sinB=2/3 what is the measure of angle A in degrees还有：the equation x^2+2ix-4=0 has as its toota根号下5-1,-根号下5-1b根号下5-i,根号下5+ic根号下3-i,根号下5+id根号下3-i,根号下3+ie根号下3-1,-

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intriangleabca=12b=16andsinB=2/3whatisthemeasureofangleAindegrees还有：theequationx^2+2ix-4=0hasasitsto

in triangle abc a=12 b=16 and sinB=2/3 what is the measure of angle A in degrees还有：the equation x^2+2ix-4=0 has as its toota根号下5-1,-根号下5-1b根号下5-i,根号下5+ic根号下3-i,根号下5+id根号下3-i,根号下3+ie根号下3-1,-
in triangle abc a=12 b=16 and sinB=2/3 what is the measure of angle A in degrees
还有：
the equation x^2+2ix-4=0 has as its toot
a根号下5-1,-根号下5-1
b根号下5-i,根号下5+i
c根号下3-i,根号下5+i
d根号下3-i,根号下3+i
e根号下3-1,-根号下3-i

in triangle abc a=12 b=16 and sinB=2/3 what is the measure of angle A in degrees还有：the equation x^2+2ix-4=0 has as its toota根号下5-1,-根号下5-1b根号下5-i,根号下5+ic根号下3-i,根号下5+id根号下3-i,根号下3+ie根号下3-1,-
第一题：可以用正弦定理得：sinA /a=sinB /b
所以得sinA=1/2,所以angle A=30度
第二题：由韦达定理得：方程根=[（-2i±根号下（4i²+16）]/2=-i±根号下3
所以选e
希望答案能满意.

我用中文回答了哈~^^
1、你可以从C点作AB边上的高CD,由sinB=2/3可以得到CD=8。然后在三角形ACD中,由于sinA=CD/AC=1/2,所以A=60°。
2、原式可化为(x+i)^2=3。因而解得答案为e。
^^~

a/sinA=b/sinB a=12 b=16 sinB=2/3 sinA=1/2 A=30

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