听音,补全下列算式,并写出答案。1. 10 + ___________ = ___________
2. ___________ + 25 = ___________
3. 27 + ___________ = ___________
4. ___________ + 11 = ___________
1. 10,20 2. 20,45 3. 31,58 4. 22,33
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