淘气 | 笑笑 | 奇思 | 妙想 | 红红 |
25下 | ?下 | 17下 | ?下 | 48下 |
(1)笑笑比淘气多拍21下,笑笑拍了多少下?
□○□=□(下)
(2)妙想拍的次数比笑笑多,比红红少,妙想拍了( )下。
(3)奇思又拍了83下,奇思一共拍了多少下?
□○□=□(下)
(4)请你提出一个数学问题,并解答。
问题:
算式:
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