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七年级数学书113页到114页 一:(1)2t-t=15 (2)a-49a=1020(3)80b-10=70(4)(a-45000)30=200二:(1)43-8x=3-112x -8x112x =3-43 -52 x =53 x =-23(2)== = X
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违法有害信息,请在下方选择原因提交举报