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题型:单选题 题类:常考题 难易度:容易
用9的乘法口诀求商1999 10
72÷8={#blank#}1{#/blank#}×{#blank#}2{#/blank#}
6×{#blank#}1{#/blank#}=54 3×{#blank#}2{#/blank#}=21 {#blank#}3{#/blank#}×9=45
{#blank#}4{#/blank#}×2=16 {#blank#}5{#/blank#}×8=56 7×{#blank#}6{#/blank#}=49
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