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4.8+1.2= 6.8-5.6= 10-4.2= 12.1+7.9=
7.8+2.2= 1.08-0.3= 12.8-3.2= 11.3-2.3=
6.9+3.1= 15.8-5.9= 13.8-2.9= 7.7+10.7=
11.4-3.5= 16.3-7.3= 7.9+12.1=
5.8-4.9= 11.8-6.9= 4.7+5.6=
6.3+1.7= 3.6-1.6= 20-4.9=
17.1+2.9= 1.8+7.2= 1.2-0.3=
①问题:
②问题:
③问题:
-x=7.5
x=
进入组卷