\(=\left(xy^2\right)^2-2xy^2+1=\left(xy^2-1\right)^2\)

The E test will be taken by all the students of the ninth form next weak

1) This picture was painted by Mai yesterday

2) A director will be met in Tuan's office by him

3) The flowers are watered by my grandfather every morning

4) Kim's parents should be called by her

5) That building has been built for 5 months

a) \(A=\sqrt{16}-\sqrt{4}=4-2=2\)

b) ĐKXĐ: \(x-1\ge0\Leftrightarrow x\ge1\)

c) \(B=\sqrt{x-1}=A=2\Leftrightarrow x-1=4\Leftrightarrow x=5\left(tm\right)\)

Chuyển qua HTHT thì bỏ started vs began đi nhé

She has bulit this house since last year

They have carried out their plan since they were at university

Đổi: 20 tấn = 20000kg

Gia tốc của xe là: \(a=\dfrac{F_e}{m}=\dfrac{-8000}{20000}=-0,4\left(m/s^2\right)\)

Đổi: 3 phút = 180s, \(60km/h=\dfrac{50}{3}m/s\)

Gia tốc của tàu:

\(v=v_o+at\Leftrightarrow a=\dfrac{v-v_o}{t}=\dfrac{\dfrac{50}{3}-0}{180}=\dfrac{5}{54}\left(m/s^2\right)\)

Quãng đường tàu đi được trong 3 phút đó:

\(s=v_ot+\dfrac{1}{2}at^2=0.180+\dfrac{1}{2}.\dfrac{5}{54}.180^2=1500\left(m\right)\)