用竖式计算：254+534= 486﹣51= 672﹣138= 23÷5= 54÷9= 135+865﹣432=
直接写得数：×0= 14×=÷= 1÷==== 25×（5+）=
直接写得数 0.4+=×=÷= 25%×4=÷7= 3.14×32= 1﹣80%=××15=×= 3000×40%=
×=÷=×= 2×=÷=÷3=+=﹣=
直接写出得数 3×= ×= ×18= ×= = ÷= ÷= 3×= ．
直接写得数．========
×0= 14×
=
÷
= 1÷
=
=
=
= 25×（5+
）=
=
×
÷
= 25%×4=
÷7=
×
×15=
×
= 3000×40%=
×
=
÷
=
×
=
=
÷3=
+
=
﹣
=
= 
×
= 
×18= 
×
= 
= 
÷
= 
÷
= 3×
= ．
=
=
=
=
=
=
=
=
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