(1)笑笑买一只羽毛球拍、一个圣诞老人、一辆玩具车,一共需要花多少钱?
(2)买一只羽毛球拍比一副乒乓球拍便宜多少钱?
(3)妈妈付给售货员阿姨50元,售货员找给妈妈18元,妈妈买的是什么商品?(请列式说明)
(4)请你提出一个数学问题,并试着解答.
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