谢晶同学是热心帮助别人的好干部。小华病了,她陪小华去医院看病。叶苹忘了带水彩颜料,她把自己的借给叶苹用。她对人很有礼貌,见到每位老师都主动问好。一天下午,她走在路上,看见两位农民伯伯吃力地拉着一辆装满蔬菜的板车,就急忙跑上去帮着推。她还是全班学习成绩最好的学生呢!
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