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题型:单选题 题类:常考题 难易度:容易
6的乘法口诀 1788
四八{#blank#}1{#/blank#} {#blank#}2{#/blank#}八四十 {#blank#}3{#/blank#}四十八
9×{#blank#}1{#/blank#}<60 {#blank#}2{#/blank#}×7<36 {#blank#}3{#/blank#}×6<22
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