`38,25 - 18,25 + 21,64 - 11,64 `

`= (38,25 - 18,25) + (21,64 - 11,64)`

`= 20 + 10`

`= 30` 

`0,125 xx 80 xx 6,94`

`= (0,125 xx 80) xx 6,94`

`= 69,4`

`4,86 xx 0,25 xx 40`

`=  (0,25 xx 40) xx4,86`

`= 48,6`

câu đầu `9,93` đâu r ạ?

từ láy âm đầu

Áp dụng dãy tỉ số bằng nhau ta có:

\(\dfrac{x}{2}=\dfrac{y}{3}=\dfrac{z}{4}=\dfrac{x+2y-3z}{2+2.3-3.4}=\dfrac{32}{-4}=-8\\\)

\(\left\{{}\begin{matrix}x=2.\left(-8\right)=-16\\y=3.\left(-8\right)=-24\\z=4.\left(-8\right)=-32\end{matrix}\right.\)

seven=>seventh

ĐỔi các câu sau thành câu gián tiếp (dốt anh nên nhờ mấy iduii anh giúp :D )

1. “ I should listen to your words” he said to me

2. Lan said to Nam “ You ought to wait for me at my house” 

3. “ I had better call you soon” He said to his wife.

4. “ We should keep our promise”The children said .

5. “ I should obey my parents” The girl said

6. “ Our house should be kept tidy”  Hoa said

7. Mr.Kim said to us” We ought to imform you about our information”

8. “ I should try my best to finish the test by myself” The boy said

9. “ I should help you” Their sister said to them

10. Jane said “I should do my home work at home.”

C. Nhờ bố mẹ, thầy cô giáo giúp đỡ, tư vấn.

`x^2 +y^2`

`=x^2+y^2 -2xy +2xy`

`=(x+y)^2 -2xy`

`=(-4)^2 -2.8`

`=16 - 16`

`=0`

`=>` Chọn `A.0`