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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811
{#blank#}1{#/blank#}+ 5 = 13 6 +{#blank#}2{#/blank#}= 14 {#blank#}3{#/blank#}+8 = 16
8 +{#blank#}4{#/blank#}=17 {#blank#}5{#/blank#}+ 8 =15 4 +{#blank#}6{#/blank#}=12
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