Step-by-step explanation:
a)71²
71×71
(70+1)×71
4970+71
5041
b)78×82
(78+2)×(82-2)
80×80
6400
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Step-by-step explanation:
a)71²
71×71
(70+1)×71
4970+71
5041
b)78×82
(78+2)×(82-2)
80×80
6400