cho bai toan A+B+C+D+Ư+F+D+E+D+G+F+G+G+F+D+S++Đ+D+D =3429877777777777777777777777777777777777777777777777 hoi A bang Bang bao nhieu

Goi a, b, c, d la bon so tu nhien lien tiep co tich

a x b x c x d =3024. Hoi a + b + c + d bang bao nhieu

cho  goc xoy bang 120 do a thuoc tia ox b thuoc tia oy lay diem c , d thuoc tia ab sao cho goc aoc bang 35 do hoi goc cob , cod co so do goc la bao nhieu

1.     cho 4 stn a lon hon hoac bang b, b lon hon hoac bang c, clon hon hoac bang d.

CM:(a-b)(a-c)(a-d)(b-c)(b-d)(c-d)

2.      CM: co the tim dc 1 stn k sao cho: (1997^k)-1 chia het cho 10^4

3.      tong cac chu so cua 1 so chinh phuong co the bang 1995 dc k?

4.      tong cua 1995 stn khac 0 dung bang 1995. Hoi UCLN cua chung la bao nhieu?

biet 25% cua mot so la 10. hoi so do bang bao nhieu

a.10  b.20  c.30  d.40

mot nguoi bo ra 42.000 d tien von mua rau sau khi ban het so rau nguoi do thu duoc 52.000 d hoi

a. tien ban rau bang bao nhieu phan tram tien von

b. nguoi do lai bao nhieu phan tram

d=1-4+7-10+......+307-310+313 hoi d bang bao nhieu

a] 3kg 240g bang bao nhieu kg    b] 4kg 7g bang bao nhieu kg    c] 32, 41 kg bang bao nhieu hg    d] 0, 75 kg bang bao nhieu dag

A) cho A = 1-5+9-13+17-21+. . .biet A = 2013.hoi A co bao nhieu so hang? Gia tri cua so hang cuoi cung?

B) mot so tu nhien khi chia cho 15 du, chia co 18 du 17 . Hoi so do khi chia cho 90 du bao nhieu?