直接写得数．
3.14×25= 32÷40%= 789+198= 4521÷51≈（估算）
÷
= 3﹣
﹣
= 1÷0.01﹣10=
×9÷=
直接写出得数．
11.7+3 0.5×90 12÷7
×4.8 12
÷
12.5×80
21
÷7 3
﹣1
+﹣+ 3
×101﹣3．
直接写出得数．
2.8+4.02= 2.5×41= 23.4÷10= 1.5+6﹣1.5
﹣
= 4.8÷12=÷
= 3.9×5×=
直接写出得数．
23.6﹣8.8=
+
=
×
= 0÷= 0.24×5=
36÷
= 2.4÷40%=
×
= 2.75﹣（
+
）=
+
×=
8.4÷0.7=
×33=
﹣
= 0.25×4= 3﹣
=÷25%= 4.8×
= 3.37+6.63=
+
×2=
×
=
1﹣100%= 3.6×
= 0.5﹣
+0.5﹣= 12.6÷3= 1.02﹣0.43=
1÷
= 10﹣1.34﹣3.66= 8÷
= 7+0÷7﹣7=
×13÷=