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Step-by-step explanation:
(6.2)²
6²+(0.2)²+2(6×0.2)
36+0.04+24/10
36+0.04+2.4
36.04+2.4
=38.44
197×203
(200-3) (200+3)
a²- b²=(a+b) (a-b)
200²-3²= 40000-9
=39991
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