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①7.8-3.1=
5.81-1.8=
1-0.9=
②0.83-0.53=
4.68-2.37=
2.94-2=
①1.78-0.9= 7.03-4.57= 13.54-8.68=
②2-0.99= 6.07-2.869= 1.5-0.306=
10-3.85= 76.8+26.82= 30.46-15.49=
= =
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