Giải:

a) 126+-20+|124|--320-|-150|

=126-20+124+320-150

=(126+124-150)+(-20+320)

=100+300

=400

b) 4³.35-52.2³+19⁷:19⁵

=2³.280-52.2³+19²

=8.(280-52)+361

=8.228+361

=1824+361

=2185

c) (13.17⁴+4.17⁴):17³-(14.9-14.5):8

=[17⁴.(13+4)]:17³-[14.(9-5)]:8

=[17⁴.17]:17³-[14.4]:8

=17⁵:17³-56:8

=17²-7

=289-7

=282

d) 132-[116-(132-128)²]

=132-[116-(4)²]

=132-[116-16]

=132-100

=32

e) 100:{250:[450-(4.5³-2².25)]}

=100:{250:[450-(4.(125-25))]}

=100:{250:[450-(4.100)]}

=100:{250:[450-400]}

=100:{250:50}

=100:5

=20

f) -80-[-130-(12-4)²]+2008⁰

=-80-[-130-(8)²]+1

=-80-[-130-64]+1

=-80-[-194]+1

=-80+194+1

=115

Chúc bạn học tốt!

a: \(=\dfrac{x-8}{\left(x-2\right)\left(x+2\right)}+\dfrac{3}{2\left(x-2\right)}\)

\(=\dfrac{2x-16+3x+6}{\left(x-2\right)\left(x+2\right)\cdot2}=\dfrac{5}{2\left(x+2\right)}\)

a: \(=\dfrac{2x\left(2x+1\right)}{\left(2x+1\right)^2}=\dfrac{2x}{2x+1}\)

25 Because this TV programme is boring, I don't like it

26 They started playing basketball in 2010

because thí TV programme is boring, I do not like it

because this programme is boringg,i don't like it

a) Sai 

b) Sai

c) đúng

d) đúng

Bài 2 : 

Bari oxit : \(BaO\)

Lưu huỳnh đioxit : \(SO_2\)

Natri hidroxit : \(NaOH\)

Kali hidroxit : \(KOH\)

Chì (II) hidorxit : \(Pb\left(OH\right)_2\)

Magie cacbonat : \(MgCO_3\)

Sắt (II) clorua : \(FeCl_2\)

Magie sunfat : \(MgSO_4\)

Canxi cabonat : \(CaCO_3\)

 Chúc bạn học tốt

Theo thứ tự từ trên xuống:

BaO

SO₂

NaOH

KOH

NaOH

Pb(OH)₂

MgCO₃

FeCl₂

MgSO₄

CaCO₃