20+30= 27+3= 22+6= 30-7= 20-6+6=
70-60= 19-8= 69-60= 78-9= 17+13+8=
13-5= 12+12= 46+4= 78+0= 5+7-9=
40+8= 66-6= 24+5= 48+6= 100-50-20=
3+16= 20+5= 13-7= 45-7= 15+6+5=
10+5= 81-4= 27-0= 20+18= 19-9+6=
5+34= +9=29 -35=30 68- =20

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

