H6i vdi thri nf,at pfrii chiy th6m bao 16u nta thi bi5 dAy nu6c; bitit ring mQt minh vdi thri nhat cnay dAV be trong vdng 45 phrit, mQt minh vdi thri hai ch6y dAy bC trong vdng 30 Phirt.[r]
Trang 1il"\l ,, pHoNG GIAo DUC vA DAo rao FilJYEN otBN cuAu v'?
DE KrrAo sAr cnAr LItgNG HQC SINH grA cror
nAvt'rrgc2016-2017 M6n: Toin - Lfp 6 (Thdi gian ldm bei 120 phrit)
Cdu 1 1O aiaml.Thgc hiQn ph6p tinh sao cho nhanh nh6t:
d.
Ciu? (6,0 di,€m)
" Tim sti tg nhi6n x sao cho 14 chia h6t cho 2x + 3'
b Cho x; y ld cfuc sO ty nhi6n tho6 rdn x + 4y chia h6t cho 13 Chmg minh ring 10x + y chia htit cho t3.
r Cnfrg minh ring hai ,6 2tr+1 vd 6n+5 ld hai s6 nguydn t6 cung nhau v6i
mgi sti tg nhi€n n.
hi x6p hdng 4,hdng5, hang 6 t10u
uoi; bi6t rdng sO hqc sinh chua
b Hai vdi nu6c ctrng chhy viro m6t bti Sau 12 phyt .nguoi ta d6ng.vdi thir
hai H6i vdi thri nf,at pfrii chiy th6m bao 16u nta thi bi5 dAy nu6c; bitit ring mQt
minh vdi thri nhat cnay dAV be trong vdng 45 phrit, mQt minh vdi thri hai ch6y
dAy bC trong vdng 30 Phirt.
Cnu 4 Q,0 didm)
a Cho 5 di6m, trong tt6 kh6ng c6 3 ditlm ndo-thing hdng Cri qua 2 di}mta
vE duoc mQt ducrngthS!1e C6 bao nhi6u ducrng thdng?
b Cflng h6i nhu th6 n6u c6 100'di6m
HCt :- -
-99 thira stj