a-2$\sqrt{ab}$+b

4 - 4$\sqrt{a}$ +a = ?
Giải thích chi tiết giùm , tks

$\frac{16}{18}+\frac{4}{12}$ + 0,75

Cho hàm số $y=f\left(x\right)$ là hàm số bậc 3 thoả mãn:

$f\left(1\right)=0$ và $2(x+3)f\text{'}\left(x\right)-f\left(x\right)=(5x^2+3x-16)(x+3), \forall x\in \mathrm{ℝ}$

Diện tích hình phẳng giới hạn bởi đồ thị $y=f\left(x\right)$ và trục hoành là:

A. $\frac{131}{4}$          B. $\frac{133}{4}$          C. $\frac{135}{4}$          D. $\frac{129}{4}$

Add modal verbs to these sentences to make them more generalising.

Firstly, when children watch ads, they often want things that they
(1) ................... (not need). Nowadays, most parents have enough
money to buy toys for their children. Besides, they want to make
their children happy. When the children see toys advertised on TV,
they (2) ................... (want) their parents to buy these toys. As a
result, children nowadays often have more toys than they have time
to play with. This (3) ................... (make) the house messy because
there are more toys than needed. Also, this (4) ................... (not teach)
the children to appreciate what they have.

Dáng vẻ của Tâm Trạng của Quốc Toản khi phải đứng lên bờ

So sánh biểu thức A với 4 biết: A= $\frac{2010}{2009}+\frac{2011}{2010}+\frac{2012}{2011}+\frac{2009}{2011}$

So sánh biểu thức A với 4 biết : A= $\frac{2010}{2009}+\frac{2011}{2010}+\frac{2012}{2011}+\frac{2009}{2011}$

2xy+$y^2$ phân tích thành nhân tử

Cho hình hộp chữ nhật có V:( 2$x^3$ + 3$x^2$ - 8x + 3) cm³ chiều dài bằng( x + 3) cm chiều cao bằng ( x - 1 )cm Hãy tính diện tích đáy của hình hộp chữ nhật đó

Câu 11 (TH). The smallest ____________ are about 0.4 micron in diameter.
A. animals B. species C. bacteria D. diseases
Câu 12 (NB). At the hospital, the doctor had David and diagnosed Malaria.
A. give off B. examined C. suffered D. reduced
Câu 13 (TH). Fruits and vegetables are essential to a balanced .
A. living condition B. diet C. scale D. exercise
Câu 14 (NB). She should ____________ hurting other people’s feeling.
A. avoid B. continue C. suggest D. protect
Câu 15 (TH). People can fight ________ more effectively if they eat a nutritious diet.
A. hygiene B. infection C. products D. headache
Câu 16 (VD). He eats a lot of burgers and chips so he is putting on _________.
A. clothes B. height C. weight D. body
Câu 17 (VDC). Mass media have helped to raise people’s awareness of _____________ choices.
A. lifestyle B. living C. livelihood D. lifelong
Câu 18 (NB). About 50.000 bicyclists suffer _____________ serious head injuries each year.
A. for B. from C. at D. on
Câu 19 (VDC). When you walk, don’t look at your feet. This will slow you down and _____________
back pain.
A. cause B. lift C. balance D. allow
Câu 20 (VDC). Having healthy skin is especially _____________ to women to maintain their beauty.
A. meaningless B. optional C. time – consuming D. crucial
Câu 21 (TH). Guests at the health spa receive a range of beauty _________.
A. minerals B. treatments C. organism D. uniform

. She tried her best so that they could catch up with her classmate 

=>In