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题型:解决问题 题类:常考题 难易度:普通
20以内的进位加法和退位减法480(10题)
12 22 32 42 52 ( ) 1 2 3 4 5 ( )
34 44 54 64 74 ( ) 2 3 4 5 6 ( )
25 36 47 58 69 ( ) 5 6 7 8 13 ( )
1,3,4,6,7,{#blank#}1{#/blank#}、{#blank#}2{#/blank#}、12,{#blank#}3{#/blank#}、{#blank#}4{#/blank#}
485,490,495,{#blank#}1{#/blank#}、{#blank#}2{#/blank#}、{#blank#}3{#/blank#}、{#blank#}4{#/blank#}.
90 81 {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#}。
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