2 ¼ -[4 ¾ -{2+( 3 1/3 ÷1 2/3 ×1 ¼ -4)}]
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2 ¼ -[4 ¾ -{2+( 3 1/3 ÷1 2/3 ×1 ¼ -4)}]
= 9/2 - [19/4 - {2 + (10/3 ÷ 5/3 × 5/4 - 4)}]
= 9/2 - [19/4 - {2 + (10/3 × 3/5 × 5/4 - 4)}]
= 9/2 - [19/4 - {2 + (10/4 - 4)}]
= 9/2 - [19/4 - {2 + (10 - 16)/4}]
= 9/2 - [19/4 - {2 -6/4}]
= 9/2 - [19/4 - {2 - 3/2}]
= 9/2 - [19/4 - {4 - 3}/2]
= 9/2 - [19/4 - 1/2]
= 9/2 - [19 - 2]/2
= (9-17)/2
= -8/2
= -4 (ans.)
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