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a. 342-62=b. (20 + 8) (20- 8)С. (3a + 7) ( 3a + 8)= (34)2 + (7 + 8) (34) +d. (6x-7y)一2x6xx7y++ 3642 |
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Answer» a) 34^2-6^2= (34+6)×(34-6)= 40×28=1120b) 20^2- 8^2 = 400-64 =336 c,d and e also |
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