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数学书宽18 爸爸身高175
学校操场长约80 一本字典厚约6
①18+67 =
②71-24 =
③60-35 =
④32+26 =
⑤52+38-36 =
⑥93-56-27 =
⑦86-(28+39)=
⑧49+31+16 =
30+26= 98-18= 8+42= 74-30= 30-(23+7)=
52-5= 12+29= 100-80= 27+9= 19+26+45 =
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