(1)21.45-2.45×4.2+7.8 (2)(2.8-2.8×0.56)÷(0.6+0.5)
(3)72×0.75-36.36÷1.8 (4)5.5÷2.5×0.5÷(2.82+2.18)
(5)16.73+3.75÷7.5×4.8 (6)(4.5-0.45)÷(0.1+0.2×0.4)
(7)[7.85+(39-3.51)÷0.6]×(6.3+0.73)
(8)7.2÷[(3.6×1.25+3.5)×0.25-1.28]
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