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计算1+(2+3)-(4+5)+(6+7)-(8+9)······-(48+49)+50=
人气:195 ℃ 时间:2019-11-10 10:09:39
解答
1+(2+3)-(4+5)+(6+7)-(8+9)······-(48+49)+50
=1+48÷4×(-4)+50
=1-48+50
=3
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