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题型:单选题 题类:常考题 难易度:容易
7的乘法口诀1819 10
4×{#blank#}1{#/blank#}=32 8×{#blank#}2{#/blank#}=48 {#blank#}3{#/blank#}×9=45
{#blank#}4{#/blank#}×6=60 {#blank#}5{#/blank#}×7=14
6×3= 2×1= 14+8= 4×6=
3×7= 5×9= 3×8= 74-20=
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