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题型:填空题 题类:常考题 难易度:普通
20以内的进位加法和退位减法569(10题)
16-9=
9+=16
18{#blank#}1{#/blank#}9=9
9{#blank#}2{#/blank#}7=16
7{#blank#}3{#/blank#}2=5
12 – 7 = 12 – 4 = 12 – 9 = 12 – 6 =
13 – 5 = 13 – 9 = 13 – 7 = 13 – 4 =
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