直接写出得数．4.5﹣1.7= = 2.5×13×4= 4×÷4×=8.2÷0.1= ×= 4.5﹣= 1+÷+1=
直接写得数 1××0=÷=（+）×56=÷+9= 24÷= 4×= 40×12.5%=+=
直接写出下面各题得数． 15×=﹣=+=×25%= 7÷=÷=÷10=×= 1÷÷=÷×=
直接写出得数．×=+=÷= 1﹣=÷3= 8×25%=÷=﹣20%=
直接写出得数： 9÷= ；÷= ；×= ；×0÷= ．
直接写得数×=×= 21×= 6÷= 10÷=+0.5= 1﹣= 2÷0.2=÷=：=
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= 2.5×13×4= 4×
÷4×
×
= 4.5﹣
= 1+
÷
×
×0=
÷
=（
+
）×56=
÷
= 4×
= 40×12.5%=
=
=
﹣
=
+
=
×25%= 7÷
=
÷
=
÷10=
×
= 1÷
÷
÷
×
=
×
=
+
=
÷
= 1﹣
=
÷3= 8×25%=
÷
=
﹣20%=
= ；
÷
×
= ；
×0÷
= ．
×
=
×
= 21×
= 6÷
=
=
+0.5= 1﹣
= 2÷0.2=
÷
=
：
=