\((9\times7+8\times9-15\times9):(1+3+5+7+\dots+17+19)+2023\\=[9\times(7+8-15)]:(1+3+5+7+\dots+17+19)+2023\\=[9\times(15-15)]:(1+3+5+7+\dots+17+19)+2023\\=0:(1+3+5+7+\dots+17+19)+2023\\=0+2023=2023\)
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\(\left(9\times7+8\times9-15\times9\right):\left(1+3+5+7+...+17+19\right)+2023\)
\(=9\times\left(7+8-15\right):\left(1+3=5+7+...+17+19\right)+2023\)
\(=9\times0:\left(1+3+5+7+...+17+19\right)+2023\)
\(=0:\left(1+3+5+7+...+17+19\right)+2023\)
\(=0+2023\)
\(=2023\)
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(9×7+8×9−15×9):(1+3+5+7+...+17+19)+2023
=9×(7+8−15):(1+3=5+7+...+17+19)+2023
=9×0:(1+3+5+7+...+17+19)+2023
=0:(1+3+5+7+...+17+19)+2023
=0+2023
=2023
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