help~2 条 F.2 maths question~

来源：学生作业帮编辑：拍题作业网作业帮分类：数学作业时间：2024/04/28 08:34:47

help~2 条 F.2 maths question~
****计算要有步骤*****

1.距离=DAsin60=22.5*根号3=22.5*1.732=39.0cm
2 距离=ABsin60+DAcos60=60根号3+22.5=126cm
3.最远距离=根号（45^2+120^2)=128cm
角=arctg(120/45)=arctg(8/3)=69.4度
4.x^2-x-3=0
x=（1+根号13）/2

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