试题 试卷
题型:单选题 题类:常考题 难易度:普通
(1)231×6.2+23.1×208﹣131×27;
(2)7﹣1.125+(2.25﹣6);
(3)1﹣2+3﹣4+5﹣6+7﹣8+9+97﹣98+99;
(4)1++++…+ .
28+16
=28+2+14
=30+14
=44
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