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(a+2)*(a-2)=a²-4
2. (10x+1)*(10x-1)=100x²-1
3. (4a-2b)*(4a+2b)=16a²-4b²
4. (0,5t+3g)*(0,5t-3g)=0,25t²-9g²
5. (2a²-o,1)*(2a²+0,1)=4a⁴-0,01