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题型:填空题 题类:常考题 难易度:容易
9的乘法口诀1875 10
九九{#blank#}1{#/blank#}
{#blank#}1{#/blank#}×8=56 2×{#blank#}2{#/blank#}=12
{#blank#}3{#/blank#}×5=40
5×9={#blank#}1{#/blank#}
{#blank#}1{#/blank#}×{#blank#}2{#/blank#}={#blank#}3{#/blank#}
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