√(82²-18²)-(√72)²=8
1) √(82-18)(82+18)=√6400=80;
2) (√72)²=72;
3) 80-72=8.
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√(82²-18²)-(√72)²=8
1) √(82-18)(82+18)=√6400=80;
2) (√72)²=72;
3) 80-72=8.