Tính, (x + 5)^2, 2.(x - 7)^2

1. (x+5)^2
2.(x-7)^2
3.(2x+1)^2
4.(3x-1)^2
5.(x+12).(x-12)
6.(2x+3)^2
7.(3-5x)^2
8.(2x-1/2).(1/2+2x)
9.(2xy+3y)^2
10.(3x^2y-2xy)^2
11.(5x-3)^2
12.(3+5x)^2
13.(1/7x-8)^2
14.(3+12x)^2
15:(2x-5).(2x+5)
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