(1)45+15×6= (2)250÷5×8=
(3)6×5÷2×4= (4)30×3+8=
(5)400÷4+20×5= (6)10+12÷3+20=
(7)(80÷20+80)÷4= (8)70+(100-10×5)=
(9) -= (10) ++=
(11)6.3÷0.07= (12) ×13=
(13)3-1.95= (14) 0÷=
(15) 0.5-= (16)540÷9=
(17) -= (18) 0.23+177%=
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