①丽丽做一个中国结用了彩绳,做6个同样的中国结用了多少米彩绳?
②奇思早上吃了6块饼干,笑笑吃的饼干数是奇思的,笑笑吃了多少块饼干?
③一张长方形纸长6dm,宽,这张纸的面积是多少平方分米?
④妈妈以6千米/时的速度慢跑锻炼,她时跑了多少千米?
A.只有② | B.只有①③ |
C.只有①②③ | D.有①②③④ |
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