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If a/b = -3/7^9 ÷ -3/7^8, the value of (a/b)^3 is |
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Answer» We have (a+b)3=a3+b3+3ab(a+b) ∴a3+b3=(a+b)3−3ab(a+b) =(9)3−3×20(9) =729−540=189 ∴a3+b3=189 |
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