(1)哪道题的结果最接近300?
450-198( ) 705-407( ) 562-297( )
(2)哪道题的结果大约是1500?
42×28( ) 29×51( ) 52×38( )
(3)哪道题的结果大于1?
7.38-6.39( ) 2.1×0.5( ) ÷( )
(4)哪道题的结果大于100?
12.03×9.07( ) 10×9.001( ) 4.03×8.05( )
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