ATQ, 447.79 ÷ √(√2400) + 30.94 × 6.07 – 5.08 × 21.96 = ? 448 ÷ √(√2401) + 31 × 6 – 5 × 22 ~ ? 448 ÷ √49 + 186 – 110 ~ ? 448 ÷ 7 + 76 ~ ? 64 + 76 ~ ? ? ~ 140
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