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2 -\left[(98.7)^{2}-(1.3)^{2}\right]\begin{array}{ll}{\text { (1) }} & {9980} \\ {\text { (3) }} & {974} & {\text { (4) } 998}\end{array} |
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Answer» a^2-b^2= (a+b)(a-b)(98.7+1.3)(98.7-1.3)9740 |
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