第1个回答 2018-10-17
5/12×9×4/15
=（5/12x4/15）x9
=1/9x9
=1
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第2个回答 2018-10-17
6.8÷0.17×1.6 =0.68÷0.17×16 =4×16 =64 7.08-0.8×1.25 =7.08-(4/5)×(5/4) =7.08-1 =6.08 65.8÷9.4+12.9 =7+12.9 =19.9
第3个回答 2018-10-17
5/12×9×4/15
=（5/15）X9X(4/12)
=1/3X9X1/3
=1