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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809
14－{#blank#}4{#/blank#}＝5 5＋{#blank#}5{#/blank#}＝11 {#blank#}6{#/blank#}－6＝7
14－7＝{#blank#}1{#/blank#}
18－9＝{#blank#}2{#/blank#}
5＋6＝{#blank#}3{#/blank#}
12 – 7 = 12 – 4 = 12 – 9 = 12 – 6 =
13 – 5 = 13 – 9 = 13 – 7 = 13 – 4 =
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