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例：14+6= ( 20 )
--How much is fourteen and six?
--It is twenty.
1. 12+7= ( )
--How much is______________ and______________?
--It is ______________.
2. 16+3= ( )
--How much is______________ and______________?
--It is______________.
3. 15+5= ( )
--How much is______________ and______________?
--It is ______________.
4. 13+4= ( )
--How much is______________ and______________?
--It is ______________.
5. 13+5= ( )
--How much is______________ and______________?
--It is ______________.
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
