一种收录机售价450元，比原价降低了150元．比原价降低了百分之几？
直接写出得数÷3=×15= 2﹣= 36+48=×75%=×4×= 298+405≈×99+99×=
直接写出得数．×=÷=÷= 1.8÷= 0.2÷3=÷=×=××0=×÷×= 18÷÷=
你能直接写出下列各题的结果吗？试试看×=÷=××= 4.5%=×12=÷4= （+）×== %
计算．×÷÷××÷6×÷7÷．
直接写得数．= 24÷======
÷3=
×15= 2﹣
=
×75%=
×4×
=
×99+99×
×
=
÷
=
÷
= 1.8÷
= 0.2÷3=
÷
=
×
=
×
×0=
×
÷
×
÷
=
×
=
÷
×
×
= 
×12=
÷4= 
+
）×
=
= %
×
÷
÷
×
×
÷6×
÷7÷
．
= 24÷
=
=
=
=
=
=
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