①0.125×3.56×0.8
=（0.125×0.8）×3.56
=0.1×3.56
=0.356；
②3.05×101
=3.05×100+3.05×1
=305+3.05
=308.05；
③1.3×3.7+0.7×3.7
=（1.3+0.7）×3.7
=2×3.7
=7.4；
④5.9×9.9
=5.9×（10-0.1）
=5.9×10-5.9×0.1
=59-0.59
=58.41．
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