月份 | 合计 | 一月 | 二月 | 三月 | 四月 | 五月 | 六月 |
用水吨数 | 45 | 50 | 60 | 60 | 70 | 81 |
(1)在上表中的空格里填上数据________.
(2)上半年月平均用水________吨.
(3)现行收费办法是:每用1吨水应缴纳水费1.6元,另加0.4元的污水处理费.这样,此单元用户六月份共缴纳水费________元.
(4)五月份比二月份的用水量多________%.
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