+ = 2- = + = - =
-2= + = - = 1- =
2.8÷4=
3﹣0.98=
0.03÷0.01=
3.14×4=
100×80%=
105%+50%=
3.14×9=
7×÷7×=
×=
÷=
1-75%=
0.1÷10%=
+=
-=
2.4–=
1-=
1--=
++=
+=
1﹣=
0.4+=
﹣+=
+5= 8× = - = × =
×8= 2- = 100× = + =
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