1125﹣997= 998+1246+9989= （8700+870+87）÷87= 125×8.8=
1.3+4.25+3.7+3.75= 17.15﹣（3.5﹣2.85）= 3.4×99+3.4= 4.8×1.01=
0.4×（2.5÷73）= （1.6+1.6+1.6+1.6）×25= （
+
﹣
）÷
= 
=
12.3﹣2.45﹣5.7﹣4.55= 
÷2
+
×
= 0.125×0.25×64= 64.2×87+0.642×1300=
78×36+7.8×741﹣7
= 
×17+
×8= 
×
+0.125×+0.5= 2.42÷
+4.58×
﹣4÷3=
25÷100
= 4.25﹣3
﹣（2
﹣1）= 3.8÷3.9+3.9÷0.1+0.1÷3.9= 12.1﹣（
+
）×105=