0.99乘以1.3-0.11乘以2.7
=0.99乘1.3-0.11乘9乘0.3
=0.99乘1.3-0.99乘0.3
=0.99乘（1.3-0.3)
=0.99
0.99乘以1.3-0.11乘以2.7如何计算
3个回答
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