口算：
450×60= 900×60= 270×20= 240×300= 500×80=
170×50= 250×40= 300×190= 800×90= 600×400=
150×60= 160×60= 400×28= 125×80= 700×20=
440×300= 210×30= 250×400= 300×40= 300×900=
相关试题
﹣
= 
÷
= 
×
= 
×
= 10×
= 
×
=
÷
= 
÷
= 15×
= 
÷
= 
+
= 
÷22=
= 
= 
= 
= 
=
= 
= 
= 
= 
．
÷10= 
×
= 1÷
= 8×
=
= 
÷
= 
×
÷
=直接写得数．
4×30%= 
﹣
= 44÷
= 0.45÷5=
10﹣0.57﹣0.43= 
×
÷×
= 
﹣×= 0.68++0.32=
8.37×2.4÷1.9×0= 1÷5+
=
= 
= 
×30= 
÷5= 2÷
=
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