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题型:填空题 题类:常考题 难易度:普通
7的乘法口诀1817 10
{#blank#}1{#/blank#}×4=32 4×{#blank#}2{#/blank#} =20
{#blank#}3{#/blank#}×5=25 3×{#blank#}4{#/blank#} =24
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