(1-2)(2-3)(3-4)...(19-20)答案是多少?

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(1-2)(2-3)(3-4)...(19-20)答案是多少?(1-2)(2-3)(3-4)...(19-20)答案是多少?(1-2)(2-3)(3-4)...(19-20)答案是多少?,fdtgmn

(1-2)(2-3)(3-4)...(19-20)答案是多少?
(1-2)(2-3)(3-4)...(19-20)答案是多少?

(1-2)(2-3)(3-4)...(19-20)答案是多少?
,fdtgmn

1 2 3 4 1 2 3 4 1 2 3 4 1,2,3,4, 1 2 3 4 1 2 3 4 1,2,3,4, 1,2,3,4, 1,2,3,4, 1,2,3,4, 1 2 3 4 1,2,3,4, 1,2,3,4, 1,2,3,4, 1、2、3、4 1+2+3×4 1,2,3,4 1+2+3+4+.