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题型:填空题 题类:常考题 难易度:困难
万以内加、减法口算 2826 10
4997,4998,4999,,,.
23 25 27 {#blank#}1{#/blank#} {#blank#}2{#/blank#}
41,42,43,{#blank#}1{#/blank#},{#blank#}2{#/blank#},{#blank#}3{#/blank#}。
1000,900,800,{#blank#}1{#/blank#},{#blank#}2{#/blank#}.
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