根据运算律在括号里填上数或字母.102+(A+98)= + + (a+b)×c= × + × .
=15÷ = :50=.
1.5: =0.75=75÷ = :36=.
:12=5÷4== %= (填小数).
3÷4=9: == 填分数= (填小写)
9: =0.75==21÷ = :4.