题目

算一算，比一比。 （1） ①15.8－4.8＋4 ②15.8－4.8÷4 ③（15.8－4.8）÷4 （2） ①84.7÷3.5＋3.5×0.2 ②84.7÷（3.5＋3.5）×0.2 ③84.7÷[（3.5＋3.5）×0.2] 答案： ①15.8-4.8＋4 =11+4 =15 ②15.8-4.8÷4 =15.8-1.2 =14.6 ③（15.8-4.8）÷4 =11÷4 =2.75 ①84.7÷3.5＋3.5×0.2 =24.2+0.7 =24.9 ②84.7÷（3.5＋3.5）×0.2 =84.7÷7×0.2 =12.1×0.2 =2.42 ③84.7÷[（3.5＋3.5）×0.2] =84.7÷[7×0.2] =84.7÷1.4 =60.5

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