1. Square of X (A-1) + 4 (1-A) 2. (one square of 1-2) x (one square of 1-3) x.x (one square of 1-9) x (one square of 1-10) All the above questions are factorized. The first question is only factorized, and the second one is factorized,

I don't understand the first question. Is x ^ 2 multiplied by the following? That is (x ^ 2-4) (A-1) = (x + 2) (X-2) (A-1)
The second problem, using the square difference formula, we can get (1-1 / 2) (1 + 1 / 2) x (1-1 / 3) (1 + 1 / 3)
Then put the bad items and the bad items together to get (1 / 2x2 / 3x3 / 4x x9/10) x (3/2x4/3x5/4x…… x11/10)=1/10x11/2=11/20

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