解：4.2÷(2/5+1/3)×9/11等于（ 567/121 ）
∵已知需求出4.2÷(2/5+1/3)×9/11等于多少
∴4.2 ÷ (2/5 + 1/3) × 9/11
= （4×10+2）/10 ÷ （6/15 + 5/15）× 9/11
= 42/10 ÷ 11/15 × 9/11
= 21/5 × 15/11 × 9/11
= 63/11 × 9/11
= 567/121
答：4.2÷(2/5+1/3)×9/11等于567/121
4.2÷(2/5+1/3)×9/11
=21/5÷1/15×9/11
=21/5×15×9/11
=63×9/11
=567/11
=51又6/11
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