有计算器的帮忙算下1:a/sin45=10/sin30 a=?2:b/sin60=10/sin30 b=?3:a/sin60=20/sin75 a=?4:20/sin60=b/sin45 b=?5:20/sinA=11/sin30 sinA=?A=?两个值都可以取吗?6:39/sinB=54/sin120 sinB=?B=?两个值都可以取吗?
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![有计算器的帮忙算下1:a/sin45=10/sin30 a=?2:b/sin60=10/sin30 b=?3:a/sin60=20/sin75 a=?4:20/sin60=b/sin45 b=?5:20/sinA=11/sin30 sinA=?A=?两个值都可以取吗?6:39/sinB=54/sin120 sinB=?B=?两个值都可以取吗?](/uploads/image/z/2495151-63-1.jpg?t=%E6%9C%89%E8%AE%A1%E7%AE%97%E5%99%A8%E7%9A%84%E5%B8%AE%E5%BF%99%E7%AE%97%E4%B8%8B1%3Aa%2Fsin45%3D10%2Fsin30+a%3D%3F2%3Ab%2Fsin60%3D10%2Fsin30+b%3D%3F3%3Aa%2Fsin60%3D20%2Fsin75+a%3D%3F4%3A20%2Fsin60%3Db%2Fsin45+b%3D%3F5%3A20%2FsinA%3D11%2Fsin30+sinA%3D%3FA%3D%3F%E4%B8%A4%E4%B8%AA%E5%80%BC%E9%83%BD%E5%8F%AF%E4%BB%A5%E5%8F%96%E5%90%97%3F6%3A39%2FsinB%3D54%2Fsin120+sinB%3D%3FB%3D%3F%E4%B8%A4%E4%B8%AA%E5%80%BC%E9%83%BD%E5%8F%AF%E4%BB%A5%E5%8F%96%E5%90%97%3F)
有计算器的帮忙算下1:a/sin45=10/sin30 a=?2:b/sin60=10/sin30 b=?3:a/sin60=20/sin75 a=?4:20/sin60=b/sin45 b=?5:20/sinA=11/sin30 sinA=?A=?两个值都可以取吗?6:39/sinB=54/sin120 sinB=?B=?两个值都可以取吗?
有计算器的帮忙算下
1:a/sin45=10/sin30 a=?
2:b/sin60=10/sin30 b=?
3:a/sin60=20/sin75 a=?
4:20/sin60=b/sin45 b=?
5:20/sinA=11/sin30 sinA=?A=?两个值都可以取吗?
6:39/sinB=54/sin120 sinB=?B=?两个值都可以取吗?
有计算器的帮忙算下1:a/sin45=10/sin30 a=?2:b/sin60=10/sin30 b=?3:a/sin60=20/sin75 a=?4:20/sin60=b/sin45 b=?5:20/sinA=11/sin30 sinA=?A=?两个值都可以取吗?6:39/sinB=54/sin120 sinB=?B=?两个值都可以取吗?
1:a/sin45=10/sin30
a/(√2/2)=10/(1/2)
a=(√2/2)*10/(1/2)
a=10√2
2:b/sin60=10/sin30
b/(√3/2)=10/(1/2)
b/(√3/2)=20
b=(√3/2)*20
b=10√3
3:a/sin60=20/sin75
a/(√3/2)=10/[(√6+√2)/4]
a=(√3/2)*10/[(√6+√2)/4]
a=5√3/[(√6+√2)/4]
a=20√3/(√6+√2)
a=20√3(√6-√2)/[(√6+√2)(√6-√2)]
a=20√3(√6-√2)/4
a=5√3(√6-√2)
4:20/sin60=b/sin45
20/(√3/2)=b/(√2/2)
20*(√2/2)/(√3/2)=b
b=10√2/(√3/2)
b=20√2/(√3)
b=20√2*√3/(√3*√3)
b=20√6/3
5:20/sinA=11/sin30
20/sinA=11/(1/2)
20/sinA=22
10/sinA=11
sinA=10/11
A=65.38或A=114.62
sinA=10/11 A两个值都可以取
39/sinB=54/sin120
13/sinB=18/sin120
13/sinB=18/(√3/2)
13/sinB=36*√3/(√3*√3)
13/sinB=12*√3
sinB=13/12√3
sinB=13√3/36
B=38.72或 B=141.28
sinB=13√3/36 B两个值都可以取