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Justin is 1． 18-year-old student. He is thinking about how to spend his money 2． the summer vacation. He has 3． about 300 dollars already. He plans to buy 4． a computer with his money, but he also wants to go for a trip with his friends. He can’t do 5． because he doesn’t have enough money. What should Justin do?
We are often in these 6． of situations. You want to see a concert on Saturday, but it is also your mother’s birthday and you do not want to let her down. In this case, you don’t have 7． time to go to both places. You must make a 8．. You must think about 9． should be done first. You should consider that 10．.
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
