题目内容
17255÷85×49-749 | 〔-(0.2+)×4.5〕÷(7.05+) | 2.75++10.2+ |
9.9+2.5×-2.7÷ | ÷〔0.5÷-×(0.4+)〕 |
解:(1)17255÷85×49-749, =203×49-749, =9947-749, =9198; (2)〔-(0.2+)×4.5〕÷(7.05+), =【-×4.5】÷13.5, =【3.75-2.4】÷13.5, =1.35÷13.5, =0.1; | ||
(3)2.75++10.2+, =(2.75+1.25)+(3.8+10.2), =4+14, =18; (4)9.9+2.5×-2.7÷, =9.9+2-1.2, =10.7; (5)÷〔0.5÷-×(0.4+)〕, =÷(-×), =÷, =22. |
分析:(1)先算除法,再算乘法,最后算减法;
(2)先算括号里面的,再算括号外面的除法;
(3)运用加法交换、结合律简算;
(4)乘除法同时脱式,再算加法,最后算减法;
(5)先算括号里面的,再算括号外面的除法.
点评:此题属于分数四则混合运算,要按照运算顺序计算,能简算的要简算.
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