直接写出得数．
4.2+3.98= 1.37﹣0.7=
1.92÷0.04=
+
=﹣
=
﹣
+
=
直接写得数．
0.23= 1.7﹣0.25﹣75%= 32×0.25= 5.2÷10%=
5﹣
= 2.5+=（
﹣
）×42= 0.25×
×4=
直接写得数．
10﹣2.1= 1÷
×
= 2.5×40=
×
×0= 5.2÷0.125÷8=
= 5.6÷0.08=
=
=1.25÷（10%÷10）=
直接写得数．
256﹣198= 34.6+15.4= 1300﹣497= 0.81+15.3= 6.3÷10%=
÷0.75=+
=×
= 1÷3×
= 9×÷9×=
直接写出得数．
1﹣
+
= 0.23= 0.23÷1%=
3÷
﹣÷3= 4×
÷4×= 8.18+2.92=