7.42-1.39➕0.58➕7.53-（0.53➕4.27）
=7.42➕7.53+0.58-（1.39+0.53➕4.27）
=14.95+0.58-6.19
=8.76+0.58
=9.34
=7.42➕7.53+0.58-（1.39+0.53➕4.27）
=14.95+0.58-6.19
=8.76+0.58
=9.34
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第1个回答 2016-05-23
7.42-1.39➕0.58➕7.53-（0.53➕4.27）
=7.42-1.39+0.58+7.53-5.8
=(7.42+0.58)+7.53-1.39-5.8
=8+7.53-7.19
=8.34
=7.42-1.39+0.58+7.53-5.8
=(7.42+0.58)+7.53-1.39-5.8
=8+7.53-7.19
=8.34
7.42-1.39➕0.58➕7.53-(0.53➕4.27)的简便运算
7.42-1.39➕0.58➕7.53-（0.53➕4.27）=7.42➕7.53+0.58-（1.39+0.53➕4.27）=14.95+0.58-6.19 =8.76+0.58 =9.34
7.42—1.39+0.58+7.53—(0.53+4.27
=7.42—1.39+0.58+7.53—0.53-4.27 =7.42—1.39+0.58+7-4.27 =14.42+0.58—1.39-4.27 =15—1.39-4.27 =15-5.66 =10+5-5.66 =10-0.66 =9.34
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