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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1861 10
9× <80 9× <10
2×{#blank#}1{#/blank#}=18
9×{#blank#}2{#/blank#}=18
4×{#blank#}1{#/blank#}<30 {#blank#}2{#/blank#}×8<40
9×{#blank#}3{#/blank#}<46 {#blank#}4{#/blank#}×5<37
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