口算．
75×2= 24×5= 37×11= 70×50=
18×5= 280×20= 42×70= 17×5=
38+324= 350﹣40= 4×25= 800÷20=
100×8= 60÷5= 109×28≈ 489×21≈
相关试题
口算．
75×2= 24×5= 37×11= 70×50=
18×5= 280×20= 42×70= 17×5=
38+324= 350﹣40= 4×25= 800÷20=
100×8= 60÷5= 109×28≈ 489×21≈
= 72×
= 12÷
=
÷3= 3÷
=
= 1﹣
÷
=
×
÷
×
= ；
×9= ； 6×
= ； 0÷
= ；
= ；
×0= ；
×
= ；
÷6= ．
=
=
=
=
= 0.8
= 1÷
= 1﹣
﹣
=
×12=
÷
=（3
+
）×0=
+
=
×
=
÷
=
÷3=
+
=
=1﹣
÷
= 1000×10%×100%=
÷3= 20×
=
÷4= 1﹣
﹣
=
÷
=
÷
=
×
=
﹣
=
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