Bai 1: Phan tich cac so sau ra thua so nguyen to:
a, 90; b, 124; c, 184; d, 177.
Bai 2: Viet cac tap hop:
a, UC(16,24); b, UC(60,90).
Bai 3: Viet cac tap hop:
a, BC(13,15); b, BC(10,12,15).
Bai 4: Tim UCLN cua:
a, 10 va 28; b, 16,80 176.
Bai 5: Tim BCNN cua:
a, 16 va 24; b, 8,10,20; c, 8,9,11.
Bai 6: a, Tim so tu nhien x lon nhat, biet rang:
40∧x va 17∧x.
b, Tim so tu nhien x , biet rang:
x∧12, x∧15,x∧20 va 150<x<200.
Bai 7: Hoc sinh ua lop 6A khi xep thanh hang 2, hang 3, hang 4 hoac hang 8 deu vua du. Biet so hoc sinh cua lop 6C tu 35 den 60 em. Tinh so hoc sinh lop 6C.
Bai 8: Mot lop 6 co 24 nu va 20 nam duoc chia thanh to de so nam va nu duoc chia deu vao to. Hoi chia duoc nhieu nhat bao nhieu to? khi ay tinh so nam va so nu moi to.
Bai 9:
a,Dien ki hieu ∈ hay ∉ vao o vuong: -4.....N; -4.....Z; 5 ....N; 0 .....Z.
b, Tim so doi cua moi so nguyen sau: -6;0;4;|-3|.
c, Sap sep cac so nguyen sau theothu tu tang dan: 4;-8;3;1;-4;0.
d, Tim gia tri tuyet doi cua moi so sau: 2020;-10;8;0.
Bai 10: Tinh:
a, (-75)+(-35); b, (-19)+48; c, 15-19; d, (-12)-(-17).
Bai 11: Tim so nguyen x, biet:
a, x-3=-4; b, x+25=10; c, |x|=5 d, -2<x<2; e,|x|<4.
Bai 12: Tim tong cua tat ca so nguyen a, biet -5<a≤ 5.
Bai 13: Chung to rang a-b va b-a la hai so doi nhau.
Bai 14: Mot doi bong nam ngoai ghi duoc 28 ban thang va de thung luoi 50 ban. Nam nay doi ghi duoc 40 ban va de thung luoi 25 ban. Tinh hieu so ban thang- ban thua cua doi bong trong moi mua giai.
Bai 15: Cho M,N la hai diem tren tia Ox. Biet OM=5cm, MN=2cm. Tinh do dai cua ON.
Bai 16: Tren tia Ox lay 2 diem A va B sao cho OA=3cm ,OB=5cm
a, Diem A co nam giua O va B khong? Vi sao?
b, Tinh do dai doan thang AB.
c, Ke Oy la tia doi cua tia Ox. Tren tia Oy lay diem C sao cho OC=3cm. Diem O co la trung diem cua CA khong?
