(439.98 ÷ 10.99) × 23.98= ? × (23.98) 2 ÷ 47.98
ATQ, (439.98 ÷ 10.99) × 23.98 = ? × (23.98)2 ÷ 47.98 (440 ÷ 11) × 24 ~ ? × (24)2 ÷ 48 960 ~ ? × 12 ? ~ 80
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