Tính nhanh (2700-81) : 9 (400-16) x 5 (2100+42) : 21

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$\text{( 2700 – 81 ) ÷ 9}$
$\text{= 2700 ÷ 9 – 81 ÷ 9}$
$\text{= 300 – 9}$
$\text{= 291}$
$\text{( 400 – 16 ) × 5}$
$\text{= 400 × 5 – 16 × 5}$
$\text{= 2000 – 80}$
$\text{= 1920}$
$\text{( 2100 + 42 ) ÷ 21}$
$\text{= 2100 ÷ 21 + 42 ÷ 21}$
$\text{= 100 + 2}$
$\text{= 102}$

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