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题型:单选题 题类:常考题 难易度:容易
一年级 20以内的退位减法819
8+4={#blank#}1{#/blank#}
8+{#blank#}1{#/blank#}=13 8+{#blank#}2{#/blank#}=16 8+{#blank#}3{#/blank#}=12
{#blank#}4{#/blank#}+6=14 {#blank#}5{#/blank#}+7=15 {#blank#}6{#/blank#}+8=11
5-1= 10-2= 18-1= 8+3=
2+4= 6+9= 12-2= 14-1=
7+5= 9+7= 5+8= 9-7=
3+7= 10+3= 10-3= 8+7=
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