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3.6-0.9=
10-3.7-6.3=
15-20÷4=
4×6÷8=
2×(25-5)=
7+12.5= 4.5+1.5= 1.2+3.1+0.8= 10-3.1-6.9=
从
推算:
________+6=10
5+________=9
3+________=8
________+________=7
9+________=19
________+4=6