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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487(10题)
15-5
9+4
3+6
19-4
17-1
19-4={#blank#}1{#/blank#}
3{#blank#}1{#/blank#} 6 = 9 10{#blank#}2{#/blank#}6 = 16 9{#blank#}3{#/blank#}4 = 5
7{#blank#}4{#/blank#}6 = 1 17{#blank#}5{#/blank#}6 = 11 19{#blank#}6{#/blank#}4 = 15
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