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题型：单选题 题类：常考题 难易度：容易
一年级 20以内的退位减法802
11-9 {#blank#}1{#/blank#} 5 13-4 {#blank#}2{#/blank#} 6 14-8 {#blank#}3{#/blank#} 13-7
15-7 {#blank#}4{#/blank#} 4 12-6 {#blank#}5{#/blank#} 8 16-8 {#blank#}6{#/blank#} 15-7
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