2.1×1.1×0.54÷（5.4×1.21÷521）=______ ．

2.1 × 1.1 × 0.54 △ 5.4 × 1.21 △ 521, = 2.1 × 1.1 × 0.54 △ 5.4 △ 1.21 × 521, = (2.1 × 521) × (1.1 △ 1.21) × (0.54 △ 5.4), = 0.5 × 1011 × 0.1, = 12 × 1011 × 110, = 122

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