口算题．= 3= ÷6=6= = == =
4× +8=70÷ +115=220﹣ ×4=120．
450÷[（150﹣120）÷2]．
285减去16的差的4倍，比1000多多少？
17255÷85×49．
356÷4×（470﹣362）
= 3
= 
÷6=
= 
= 
=
= 
=
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