文彦博树洞取球
文彦博少时,与群儿击球。球忽跃入树穴,群儿谋取之,穴深,不能得。彦博以盆取水,灌入穴中,球遂浮出。
1.选择加点字正确的解释,画“√”。(1)群儿谋取
(2)球
2.这件事的起因是
3.其他小朋友没有拿到球的原因是
4.文彦博想到的办法是
同类型试题
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
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