Sagot :
Adım adım açıklama:
sadece 1.i çözebildim ama bu doğru çikti
Cevap E şıkkıdır.
2020²-2018²=(2020-2018)×(2020+2018)=2×4038
1010²-1009²=(1010-1009)×(1010+1009)=1×2019=2019
(4038×2)/2019=4
1002×998=(1000+2)×(1000-2)=1000²-2²
1003×997=(1000+3)×(1000-3)=1000²-3²
1000²-2²-(1000²-3²)=3²-2²=5
25²+8²=(25+8)²-2×25×8=33²-400=33²-20²
Formüller a²-b²=(a-b)×(a+b)
(a+b)²=a²+2ab+b²
(a-b)²=a²-2ab+b²
a²+b²=(a+b)²-2ab=(a-b)²+2ab
(a+b)²=(a-b)²+4ab
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