解方程:30t-0.5*0.25*t^2=1800
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/28 19:43:30
![解方程:30t-0.5*0.25*t^2=1800](/uploads/image/z/10784557-37-7.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%9A30t-0.5%2A0.25%2At%5E2%3D1800)
解方程:30t-0.5*0.25*t^2=1800
解方程:30t-0.5*0.25*t^2=1800
解方程:30t-0.5*0.25*t^2=1800
30t-0.5*0.25*t^2=1800
30t-0.125t²=1800
240t-t²=14400
t²-240t+120²=0
(t-120)²=0
t=120
解方程:30t-0.5*0.25*t²=1800
两边同乘以8,得240t-t²=14400
移项得t²-240t+14400=(t-120)²=0,故得t=120.
30t-0.125t^2=1800
0 .125t^2=30t-1800
t^2=(30t-1800)*0.125
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t=√3.75t-225