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题型:解决问题 题类:常考题 难易度:困难
20以内的进位加法和退位减法473(10题)
一共有几个珠子?
{#blank#}1{#/blank#}
{#blank#}2{#/blank#}
{#blank#}3{#/blank#}
{#blank#}1{#/blank#} + {#blank#}2{#/blank#} = {#blank#}3{#/blank#}
{#blank#}4{#/blank#} - {#blank#}5{#/blank#} = {#blank#}6{#/blank#}
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