0 - 2 × 9 + 10!!
= 10!! = ( 10 × 8 × 6 × 4 × 2 )
= 80 × 24 × 2
= 80 × 48
= 0 - 2 × 9+ 3840
= 0 - 18 + 3840
= -18 + 3840
= 3822
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0 - 2 × 9 + 10!!
= 10!! = ( 10 × 8 × 6 × 4 × 2 )
= 80 × 24 × 2
= 80 × 48
= 0 - 2 × 9+ 3840
= 0 - 18 + 3840
= -18 + 3840
= 3822