135÷27+12×4 =5+48=53 、
1620-1320÷60+80 =1620 - 22 +80 = 1678 、
(85+14×5)÷5 =85/5 + 14 = 13 + 14 =27 、
520÷【13×(43-33)】=(520/13)/10 = 40/10 = 4
490/(210/30))=490/7=70
135÷27+12×4 =5+48=53 、
1620-1320÷60+80 =1620 - 22 +80 = 1678 、
(85+14×5)÷5 =85/5 + 14 = 13 + 14 =27 、
520÷【13×(43-33)】=(520/13)/10 = 40/10 = 4
490/(210/30))=490/7=70