giải dùm mik
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Bài 2:
Áp dụng định lí Pytago vào ΔEFG vuông tại E, ta được:
\(FG^2=EF^2+EG^2\)
\(\Leftrightarrow FG^2=15^2+5^2=250\)
hay \(FG=5\sqrt{10}\left(cm\right)\)
tam giác ABC vuông tại A có
AB=sin300.BC
BC=80:1/2
BC=160m
=>AC2=BC2-AB2
AC2=1602-802=19200
AC=80\(\sqrt{3}\) m
tam giác ABD vuông tại A có
AB=sin450.AD
AD=80:\(\dfrac{\sqrt{2}}{2}\)
AD=\(80\sqrt{2}\) m
CD = AC-AD=\(80\sqrt{3}-80\sqrt{2}\approx25m\)
One of the biggest environmental impacts of human activities is air pollution
1 were
2 was
3 Were
4 was
5 was
6 was
7 was
B
1 John could play the piano when he was 6
2 My brother could draw beautiful picture when he was seven
3 We could speak 2 foreign languages when we were 18
4 She could dance when she was 8
5 Tiger Woods could play goft when he was 3
C
2 Could you write you name when you were 3
3 Could you read when you were 2
4 Could you count from 1 to 10 when you were 2
5 Could you talk when you were 3
6 Could you ride a bike when you were 6
7 Could you swim when you were 5
A.
1. were
2. was
3. weren't
4. was
5. was
6. was
7. wasn't
B.
2. John could play the piano when he was six.
3. My brother could draw beautiful pictures when he was seven.
4. We could speak two foreign languages when we were eighteen.
5. She could dance when she was eight.
6. Tiger Woods could play golf when he was three.
C.
2. Could you write your name when you were three?
3. Could you read when you were two?
4. Could you count from one to ten when you were two?
5. Could you talk when your were three?
6. Could you ride a bike when you were six?
7. Could you swim when you were five?
Em đi học để có thêm kiến thức áp dụng vào cuộc sống
Con người cần phải có bạn bè vì những lúc ta buồn hay vui thì còn có người chia sẻ, tâm sự, có thể học tập thêm được nhiều điều tốt từ bạn
Sống đẹp nghĩa là sống hết mình và không bao giờ chịu khuất phục trước số phận. Sống đẹp là lối sống có văn hóa, lịch sự, có tri thức, có tình người. Sống đẹp không bao gồm suy nghĩ ích kỷ, chỉ biết mình mà không biết người, giúp người nhưng vụ lợi, vì mục đích cá nhân. Sống đẹp là sống có ích. < Tham khảo nhé bạn >
Trẻ hút thuốc lá là xấu và nó có hại cho sức khỏe lẫn đạo đức
a) Xét 2 tam giác AHB và AHC có:
AB = AC(GT); góc AHB = AHC(Do AH vuông góc BC); AH cạnh chung
=) 2 tam giác AHB và AHC bằng nhau
Phần b và c tối mik làm giúp cho còn bây h mik hok trực tuyến