题目

脱式计算,能简算的要简算。 ①6.07-4.5+0.98 ②29×(65-560÷16) ③1500÷25×4 ④37.61-(7.61+1.25) ⑤99×23+23 ⑥1428÷[(103-89)×6] 答案:①6.07-4.5+0.98 =1.57+0.98 =2.55 ②29×(65-560÷16) =29×(65-35) =29×30 =870 ③1500÷25×4 =60×4 =240 ④37.61-(7.61+1.25) =37.61-7.61-1.25 =30-1.25 =28.75 ⑤99×23+23 =(99+1)×23 =100×23 =2300 ⑥1428÷[(103-89)×6] =1428÷(14×6) =1428÷84 =17
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