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8-5-2=
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(1)4×8-8= (2)45-5×5=
(3)7×9+9= (4)1000-800=
4.8-2.6=
0.88-0.8=
7.9+7.1=
4.8-3.5=
9.5-8.5=
7-3.8=
8+7=□
15-8=□
15-7=□