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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
9×{#blank#}1{#/blank#} =54 49÷{#blank#}2{#/blank#} =7 8×{#blank#}3{#/blank#} =24
42÷{#blank#}4{#/blank#} =6 5×{#blank#}5{#/blank#} =30 {#blank#}6{#/blank#}÷8=2
青蛙过河．
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