题目
递等式计算。(选择合理的方法计算)
① × ÷
②( ÷ +0.8)×
③ ÷7+ ×
④24×( + +25%)
⑤ +( + )×
⑥ ÷(5- - )
答案:①13×35÷59 =15÷59 =925 ②(32÷34+0.8)×58 =(2+0.8)×58 =2.8×58 =74 ③813÷7+17×513 =(813+513)×17 =1×17 =17 ④24×(12+13+25%) =24×12+24×13+24×25% =12+8+6 =26 ⑤58+(47+12)×125 =58+1514×125 =58+372 =23 ⑥14÷(5-1120-920) =14÷(5-1) =14÷4 =116