器材名称 | 气排球 | 羽毛球拍 | 羽毛球 | 跆拳道脚靶 |
价格 | 15.70元/个 | 39.85元/一对 | 23.92元/筒 | 36.30元/个 |
(2)“双减”政策落地后,学校开展了形式多样的社团活动,并与课后延时服务进行融合。跆举道需要购入20个脚靶,现在店铺活动买一送一,需要花费多少钱?
(3)学校计划用400元购买8对羽毛球拍和3筒羽毛球,钱够用吗?请说明理由。
![](http://static.xuejinqu.com/images/y-prise.png)
同类型试题
![](http://static.xuejinqu.com/images/medal.png)
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
![](http://static.xuejinqu.com/images/avatar.png)
![](http://static.xuejinqu.com/images/avatar.png)
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
![](http://static.xuejinqu.com/images/avatar.png)
![](http://static.xuejinqu.com/images/avatar.png)