250×4的积的末尾有2个零． ．
直接写得数．÷13= ×9= ÷= +=20%÷= ﹣×0= 6÷= ×=1÷= 0.5×=
直接写出得数． ﹣= += 2﹣= 0.25+=×= ÷= 12÷= ×18=
口算：= = = = == = 1.25×32×0.25= =
直接写出得数．﹣= ×= ÷= 1÷40%= 4÷﹣÷4=75%+= ÷22= 80%÷= 26×= ×÷×=
24×5= 2300﹣200= 0.8×0.4= ÷= ：9=10﹣4.2= 8×12.5%= 26.26÷26= 1.2﹣= ÷20=400÷5÷8= 70+30×2= 0.25÷= +2= 0.32=99×0.2+0.2= ×= 3.36×0.1= a÷2= 48÷60=
÷13= 
×9= 
÷
= 
+
=
= 
﹣
= 
=
= 0.5×
=
﹣
= 
+
= 2﹣
= 0.25+
=
×
= 
÷
= 12÷
= 
×18=
= 
= 
= 
= 
=
= 
= 1.25×32×0.25= 
=
﹣
= 
×
= 
÷
= 1÷40%= 4÷
﹣
= 
÷22= 80%÷
= 26×
= 
×
÷
÷
= 
：9=
= 
÷20=
= 
+2= 0.32=
×
= 3.36×0.1= a÷2= 48÷60=
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