2016-04-09 11:04发布
方法反反复复凤飞飞反复
2.7*4.9+7.4*4.9-0.49
=2.7x4.9+7.4x4.9-4.9x0.1
=（2.7+7.4-0.1）x4.9
=10x4.9
=49
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2.7*4.9+7.4*4.9-0.49
=2.7x4.9+7.4x4.9-4.9x0.1
=（2.7+7.4-0.1）x4.9
=10x4.9
=49
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