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\left. \begin{array} { l l } { \operatorname { lg } ( x + a ) ( x + b ) = x ^ { 2 } + ( a + b ) x + } \\ { 103 \times 104 } \end{array} \right. |
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Answer» (i) (100+3)(100+4) = 100^2+(3+4)100+3×4 = 10000+700+12 = 10712(ii) (5 + 0.1)(5 + 0.2) = 52 + (0.1+0.2)5 + 0.02 = 25 + 1.5 + 0.02 = 26.52 |
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