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(3)(5)(2)(4)(1)(6)(7) (5)(2)(4)(3)(1)(6)(7) (5)(2)(4)(1)(3)(6)(7) (4)(1)(5)(2)(3)(6)(7)
(1)(4)(5) (1)(4)(5)(6) (1)(3)(4)(5) (3)(4)(5)
4个 3个 2个 1个
(1)(4)(5)(6) (2)(3)(4)(5) (1)(3)(5)(6) (1)(2)(4)(6)
4个 3个 2个 1个
(1)(3)(5)(2)(4)(8)(6)(7) (1)(3)(2)(6)(4)(5)(8)(7) (1)(4)(2)(5)(3)(7)(6)(8) (1)(3)(2)(5)(4)(6)(7)(8)
B1:C4 B1:C2,C3:C4 B1:C2:C4 B1:C2C3:C4
如果EF∥GH,那么∠4+∠3=180° 如果AB∥CD,那么∠1+∠4=180° 如果AB∥CD,那么∠1=∠2 如果AB∥CD,那么∠2=∠3
(1)(3)(5)(2)(4)(8)(6)(7) (1)(3)(2)(6)(4)(5)(8)(7) (1)(4)(2)(5)(3)(7)(6)(8) (1)(3)(2)(5)(4)(6)(7)(8)
(1)(2)(3) (1)(2)(4) (1)(3)(4) (2)(3)(4)
数列2,3,5可表示为{2,3,5} 数列2,4,6,8与数列8,6,4,2是相同的数列 集合{1,3,5,7}与集合{7,5,3,1}是相同的集合 数列1,3,5,7,…可记为{2n+1}(n∈N*)
π0=1 2﹣2=﹣4 ﹣|﹣2|=2