计算下面各题,能简算的要简便运算。5×44×25123×67-123+123×34
18÷2=÷3=÷4=÷8=
计算:××;×12×;××;××;
××=
计算:××= ××= ×0×= ××=
直接写得数。××=××=××=××4=