(a-0.1) ²=a²-2*a*0.1+0.1²
(a-0.8) ²=a²-2*a*0.8+0.8²
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(a-0.1) ²=a²-2*a*0.1+0.1²
(a-0.8) ²=a²-2*a*0.8+0.8²