A 君子之交淡如水
B 君子坦荡荡,小人常戚戚
C 三人行,必有我师
D 多个朋友多条路
(Ⅰ)求数列{an}的通项公式;
(Ⅱ)证明: n2−13<a1a2+a2a3 +… +anan+1<n2 (n∈N*)
35 × 34 ____ 35
1415 ____ 1415 ÷ 1730
16× 58 ____16÷ 58
45 ÷ 45 ____ 23 × 32
指出下列语句的错误,并改正:
(1)A=B=50
(2)x=1,y=2,z=3
(3)INPUT“How old are you”x
(4)INPUT,x
(5)PRINT A+B=;C
(6)PRINT Good﹣bye!
My grandma ____ (watch) TV every day.