Lớp 2 - Đề khảo sát giữa học kỳ I lớp 2

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["74","Nhỏ hơn","Lớn hơn","82","9","8","63","5","6","21","+",[1,1,0,0],"25",{"ans1":"13 + 72 = 85","ans2":"85"},{"ans1":"71 - 13 = 58","ans2":"58"}]