数量/千克 | 2 | 4 | 5 | 8 | 10 | 12 |
总价/元 | 8 | 16 | 20 | 32 | 40 | 48 |
(1)妈妈购买苹果的总价和购买的数量成正比例吗?为什么?
(2)根据表中数据,在下图中描出总价和购买的数量所对应的点,再把它们用线连起来。
(3)看上图判断,妈妈买5千克苹果需要多少元?60元可以买多少千克苹果?
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