30.8÷[14-(9.85+1.07)] 10
[60-(9.5+28.9)]÷0.18 120
3.416÷(0.016×35) 61/10
58870÷(105+20×2) 406
81÷[(72-54)×9] 1/2
42÷(15+136 ) 42/151
(800-981)÷9 -181/9
(125+275)÷8 50
25÷(187-143) 25/44
392÷(45-38) 56
(26+34)÷78 10/13
36÷(128-85) 36/43
450÷(103-94) 50
30道还不够,但也有13道了,能力有限.记得把“÷”改成分数线.右边是答案!