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题型:单选题 题类:常考题 难易度:容易
整十数加、减整十数1038(10题)
72-({#blank#}1{#/blank#})=2 ({#blank#}2{#/blank#})+4=40 ({#blank#}3{#/blank#})-20=20
80-({#blank#}4{#/blank#})=8 40+({#blank#}5{#/blank#})=58 ({#blank#}6{#/blank#})+25=55
54-20=52
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