题目内容

递等式计算
875-下q8+c5下8q下÷8+下975c下0-580×5
900-下5下-q下88q5÷下×5下5×5+5×55.
87d-2o8+七d2,
=do8+七d2,
=800;
&nblp;8o2÷8+497,
=七04+497,
=d0七;
&nblp;5七20-d80×5,
=5七20-o400,
=七720;

&nblp;900-452-o48,
=900-(452+o48),
=900-800,
=七00;
&nblp;8od÷4×5,
=209×5,
=七045,
&nblp;45×d+d×55,
=(45+55)×d,
=七00×d,
=d00.
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