Thực hiện phép tính: \( x(1-x) + (x-1)^2 \). \( (x+2)^2 - (x-3)(x+1) \)

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Bài 4: Thực hiện phép tính
1) \( x(1-x) + (x-1)^2 \)
2) \( (x+2)^2 - (x-3)(x+1) \)
3) \( (x-2)^2 + (x-1)(x+5) \)
4) \( (x-3)^2 - x^2 + 10x - 7 \)
5) \( (x+4)(x-2) - (x-3)^2 \)
6) \( (x+3)(x-3) - x(23+x) \)
7) \( (1-2x)(5-3x) + (4-x)^2 \)
8) \( (x+2)^2 - (x+3)(x-3) + 10 \)
9) \( (x+1)^2 + (x-2)(x+2) - 4x \)
10) \( (x-1)^2 - (x-4)(x+4) + (x+3)^2 \)
11) \( (x+4)^2 + (x+5)(x-5) - 2x(x+1) \)
12) \( (x-1)^2 - 2(x+3)(x-3) + 4x(x-4) \)
13) \( (y-3)(y+3)(y^2+9) - (y^2+2)(y^2-2) \)
14) \( (x-3)^2 - x^2 + 10x - 7 \)