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题型:填空题 题类:常考题 难易度:普通
9的乘法口诀1880 10
2×3 2×9 4×8 7+7+7 5×2
4×{#blank#}1{#/blank#}<25
{#blank#}2{#/blank#}×7<29
47<{#blank#}3{#/blank#}×8
{#blank#}1{#/blank#}×{#blank#}2{#/blank#}={#blank#}3{#/blank#};{#blank#}4{#/blank#}×{#blank#}5{#/blank#}={#blank#}6{#/blank#}。
{#blank#}1{#/blank#}×{#blank#}2{#/blank#}={#blank#}3{#/blank#}(根)
{#blank#}4{#/blank#}×{#blank#}5{#/blank#}={#blank#}6{#/blank#}(根)
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