试题 试卷
题型:单选题 题类:常考题 难易度:普通
-b-c=-(b+c)
19+199+1999+19999+199999
345+347+349+351+353+355+357
={#blank#}1{#/blank#}×{#blank#}2{#/blank#}
={#blank#}3{#/blank#}
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