12+12=?
theo dõi mình nha!
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\(\dfrac{5}{9}:\dfrac{12}{9}+\dfrac{1}{2}=\dfrac{5}{12}+\dfrac{1}{2}=\dfrac{5}{12}+\dfrac{6}{12}=\dfrac{11}{12}\)
Gọi số tự nhiên cần tìm là x
Theo đề, ta có: \(\dfrac{x+15}{x+17}=\dfrac{11}{12}\)
\(\Leftrightarrow12x+180=11x+187\)
hay x=7
Đi bộ 3 km mất số thời gian là :
12 phút 38 giây x 3 = 36 phút 114 giây = 37 phút 54 giây
Đáp số : 37 phút 54 giây
Thời gian để tiến đi bộ hết 3km là:
12 phút 38 giây * 3 = 36 phút 114 giây = 37 phút 54 giây
Đáp số: 37 phút 54 giây
Thân cao A > a thân thấp
Hoa đỏ B > b hoa trắng
Cây đậu thân cao, hoa đỏ thuần chủng KG AABB
Cây đậu thân thấp, hoa trắng có KG aabb
P: AABB ( thân cao, hoa đỏ) x aabb (thân thấp, hoa trắng)
G(P): AB______________ab
F1: AaBb (100%)___ Thân cao, hoa đỏ (100%)
F1 x F1: AaBb (Thân cao, hoa đỏ) x AaBb (Thân cao, hoa đỏ)
G(F1): (1/4AB:1/4Ab:1/4aB:1/4ab)___(1/4AB:1/4Ab:1/4aB:1/4ab)
F2: 1/16AABB:2/16AaBB:2/16AABb:4/16AaBb:1/16aaBB:2/16aaBb:1/16AAbb:2/16Aabb:1/16aabb
(KH: 9/16 thân cao, hoa đỏ: 3/16 thân thấp, hoa đỏ: 3/16 thân cao, hoa trắng: 1/16 thân thấp, hoa trắng)
I. Writing
11. He uses all his free time to look after his garden. (spends)
→ He spends all his free time looking after his garden.
12. He likes to listen to pop music than to watch TV after school. (prefers)
→ He pferer listening to pop music than watching TV after school.
13. Making crafts or collecting things like stamps and coins arevery interesting. (It’s)
→ It's very interesting to make crafts or collect things like stamps and coins.
14. We usually visit museums when we have leisure time. (enjoy)
→ We enjoy visiting museums when we have leisure time.
15. I don’t like to get up early and prepare breakfast in the cold winter days. (hate)
→ I hate getting up early and preparing breakfast in the cold winter days.
16. Vinh really loves to hang out with friends. (enjoys)
→ Vinh enjoys hanging out with friends.
17. Playing beach games is very interesting. (it is)
→ It is very interesting to play beach games.
18. It is not a good idea to spend too much time on computer games. (better to avoid)
→ It is better to avoid spending too much time on computer games.
19. My parents insist me on learning something interesting. (wants)
→ My parents want me to learn something interesting.
20. Jenny finds reading poetry boring. (dislikes)
→ Jenny dislikes reading poetry.
a: Xét ΔABE vuông tai A và ΔHBE vuông tại H có
BE chung
gócABE=gócHBE
=>ΔABE=ΔHBE
b: ΔBAE=ΔBHE
=>BA=BH; EA=EH
=>BE là trung trực của AH
12+12 = 12.2= 24
24!!!