Toán Lớp 8: {2x-3(x-1)-5[x-4(3-2x)+10]}.(-2x)
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Toán Lớp 8: {2x-3(x-1)-5[x-4(3-2x)+10]}.(-2x)
Comments ( 2 )
\left\{ {2x – 3\left( {x – 1} \right) – 5\left[ {x – 4\left( {3 – 2x} \right) + 10} \right]} \right\}.\left( { – 2x} \right)\\
= \left[ {2x – 3x + 3 – 5\left( {x – 12 + 8x + 10} \right)} \right].\left( { – 2x} \right)\\
= \left( { – x + 3 – 45x + 10} \right).\left( { – 2x} \right)\\
= \left( { – 46x + 13} \right).\left( { – 2x} \right)\\
= 92{x^2} – 26x
\end{array}\]