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题型:单选题 题类:常考题 难易度:普通
20以内的进位加法和退位减法535(10题)
17-2={#blank#}1{#/blank#}
20-1={#blank#}2{#/blank#}
9+1={#blank#}3{#/blank#}
7+2={#blank#}4{#/blank#}
8+2={#blank#}5{#/blank#}
{#blank#}2{#/blank#}.
5-4{#blank#}1{#/blank#}5-1 2+6{#blank#}2{#/blank#}4-1 4-1{#blank#}3{#/blank#}3-1
3+2= 2+7= 10-9 =
7-4 = 5+5 = 5-5 =
7+2–5 = 10-6+5=
8+5-2 = 6+4+0 =
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