17.6*1.3+6.4/1.3-9.6*1.3+5.3/1.3
=（17.6-9.6）*1.3+(6.4+5.3)/1.3
=8*1.3+ 11.7/1.3
=10.4+9
=19.4
17.6*1.3+6.4/1.3-9.6*1.3+5.3/1.3
7个回答
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