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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1998 10
3×{#blank#}1{#/blank#}=27 {#blank#}2{#/blank#}×8=40 6×{#blank#}3{#/blank#}=42 {#blank#}4{#/blank#}×7=42
2×{#blank#}5{#/blank#}=18 5×{#blank#}6{#/blank#}=35 4×5={#blank#}7{#/blank#} 6×{#blank#}8{#/blank#}=54
{#blank#}1{#/blank#}×5＜36 {#blank#}2{#/blank#}×7＜44
{#blank#}3{#/blank#}×4＜37 {#blank#}4{#/blank#}×8＜26
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