Question

[Pham Thuy Trang]

Bai63  ; khong lam phep tinh hay cho biet chu so tan cung cua moi ket qua sau;

  1. (1981+1982+1983+....+1989)-(21*23*25*27)

    A.0         B.5       C.2

2. 32*44*75*69-21*39*63*55

    A.0        B.1       C.5

Bai 64  ;ban co the cat 5 hinh tam giac vuong bang nhau dung 5 tam giac vuong nay ghep lai thanh 1 hinh tam giac vuong duoc khong?

Answer 1

[chế trần ngọc thinh]

1/ B

2/ A

Answer 2

[Anh2Kar六]

\(\text{1,B 2,A}\)