问题 解答题 口算小博士.34×12=67÷2=80%-20%=4×25%+16×25%=67×16=58×72%=45×38÷35=57×98÷57×98= 答案 34×12=38,67÷2=37,80%-20%=0.6,4×25%+16×25%=5,67×16=17,58×72%=0.45,45×38÷35=12,57×98÷57×98=8164.故答案为:38,37,0.6,5,17,0.45,12,8164.