"Why is Hoa not lazy?" hay "Why is not Hoa lazy?" là đúng.
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1.Yes,it is because pizza is delicious,blended by simple ingredients
2.Yes,it is because clean vegetables is good for health
3.No,it isn'y because vegetables is good and clean for health everyone
4.No,it isn't because vegetables is cheap for somebody
Tịks nhé!Học tôta!:))
1. My school is bigger than Hoa.
2. She is lazy, but her brother is very lazier = lazy
3. Playing is more interesting than study = studying
4. Mary is the most beautiful of the twins
5. These exercises are not more difficult than those ones = this one
1. Hoa -> Hoa's
2. bỏ very
3. study -> studying
4. most -> more
5. Câu này sửa cả câu: These exercises are not as difficult as those ones.
1. He will be good at dancing.
2. She isn't interested in watching football matches.
3. Why don't we plant trees around our houses to get shade and fresh air?
4. We put garbage buns in the schoolyard to prevent lazy students from throwing trash.
He will be good at dancing
She is not interested in watching football matches
Why don't we plant trees around our houses to get shade and fresh air?
We should put garbage bins around the schoolyard to prevent lazy students from throwing trash
a) Gọi theo thứ tự ∆1, ∆2, ∆3 là giá của các vectơ , ,
cùng phương với => ∆1 //∆3 ( hoặc ∆1 = ∆3 ) (1)
cùng phương với => ∆2 // ∆3 ( hoặc ∆2 = ∆3 ) (2)
Từ (1), (2) suy ra ∆1 // ∆2 ( hoặc ∆1 = ∆2 ), theo định nghĩa hai vectơ , cùng phương.
Vậy
a) đúng.
b) Đúng.
a) Đúng b) Đúng
c) Hai vectơ = ( 5; 3) và = (3; 5) không cùng phương nên không thể đối nhau, do vậy câu c) sai
d) Đúng
a) Nối BM
Ta có AM= AB.cosMAB
=> || = ||.cos(, )
Ta có: . = ||.|| ( vì hai vectơ , cùng phương)
=> . = ||.||.cosAMB.
nhưng ||.||.cos(, ) = .
Vậy . = .
Với . = . lý luận tương tự.
b) . = .
. = .
=> . + . = ( + )
=> . + . = = 4R2
"Why is not Hoa lazy?" là đúng.