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a² - b² = 7² - 3²
= 49 - 9 = 40
dan a - b= 7 - 3 =4
nilai a + b = 7 + 3 = 10
4. × + × = 6
2× = 6
× = 6 - 2
= 4
× x × = 4
ײ = 4
× =√4
= 2
jumlah kuadrat = 4² + 2²
= 16 + 4
= 20