口算
23+34= 47+36=" " 55-36= 82-46= 700-370= 790-560=
57-25= 43+38=" " 56-28= 34+54= 290+480= 530-360=
62-36= 45+47=" " 43-27= 95-61= 340+380= 790-560=
口算
23+34= 47+36=" " 55-36= 82-46= 700-370= 790-560=
57-25= 43+38=" " 56-28= 34+54= 290+480= 530-360=
62-36= 45+47=" " 43-27= 95-61= 340+380= 790-560=
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