题目

下面各题怎样算简便就怎样算。 ①150+120÷6×5 ②9.43-(0.39+2.43) ③ + × + ④ × + ÷ ⑤ ÷ [ × ( + )] 答案:①150+120÷6×5 =150+120÷6×5 =150+20×5 =150+100 =250 ②9.43-(0.39+2.43) =9.43-2.43-0.39 =7-0.39 =6.61 ③ 13 + 23 × 56 + 49 =13+(59+49) =13+1 =113 ④ 718 × 54 + 1118 ÷ 45 =(718+1118)×54 =1×54 =54 ⑤ 35 ÷ [ 38 × ( 415 + 25 )] =35÷[38×23] =35÷14 =125
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