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Lấy 2 số trừ cho nhau ta được:

c47+8b4+82a-(9b3+76a+c09)

=(c47-c09)+(8b4-9b3)+(82a-76a)

=38+(-99)+60

=-1

Vậy số bên phải lớn hơn số bên trái 1 đơn vị.

1. A stand B apple C hand D father

2. A dark B cancel C action D travel

3. A fantastic B part C fact D camera

4 A automatic B had C activity D yard

5 A calm B bag C cat D bad

6 A animal B card C heart D cart

7 A thanks B caner C channel D smart

8 A land B start C stand D plastic

9 A bag B that C can D star

10 A plant B hat C far D plan

1.D

2.A

3.B

4.D

5.A

6.A

7.D

8.B

9.D

10.C

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A=(a+b)(b+c)(c+a)+abcA=(a+b)(b+c)(c+a)+abc

=a2b+ab2+a2c+ac2+b2c+bc2+2abc+abc=a2b+ab2+a2c+ac2+b2c+bc2+2abc+abc

=ab(a+b+c)+bc(a+b+c)+ca(a+b+c)=ab(a+b+c)+bc(a+b+c)+ca(a+b+c)

=(a+b+c)(ab+bc+ca)=(a+b+c)(ab+bc+ca)

Vậy....

\((a+b)(b+c)(c-a)+(b+c)(c+a)(a-b)+(c+a)(a+b)(b-c)\)

\(=(b+c)(ac-a^2+bc-ab)+(b+c)(ac-bc+a^2-ab)+(c+a)(a+b)(b-c)\)

\(=(b+c)(ac-a^2+bc-ab+ac-bc+a^2-ab)+(c+a)(a+b)(b-c)\)

\(=(b+c)(2ac-2ab)+(c+a)(a+b)(b-c)\)

\(=(2ab+2ac)(c-b)-(c+a)(a+b)(c-b)\)

\(=(c-b)(2ab+2ac-a^2-ab-ac-bc)\)

\(=(c-b)(b-a)(a-c)\)

I. Find the word which has a different sound in the part underlined: ( Chữ gạch chân là chữ a )

1. A stand B apple C hand D father

2. A dark B cancel C action D travel

3. A fantastic B part C fact D camera

4 A automatic B had C activity D yard

5 A calm B bag C cat D bad

6 A animal B card C heart D cart

7 A thanks B caner C channel D smart

8 A land B start C stand D plastic

9 A bag B that C can D star

10 A plant B hat C far D plan

Chọn từ phát âm khác

1 A potato B bread C gray D they

2 A . Asian B anyone C send D debt

3 A gate B safe C tape D ready

4 A them B met C . Canadian D get

5 A heavy B date C late D lake

6 A bell B bed C tell D Australian

7 A cape B breath C mane D mate

8 A crazy B pen C scent D stretch

9 A fate B leather C paid D date

10 A member B pray C tender D November

Chọn từ phát âm khác

1 A potato B bread C gray D they

2 A . Asian B anyone C send D debt

3 A gate B safe C tape D ready

4 A them B met C . Canadian D get

5 A heavy B date C late D lake

6 A bell B bed C tell D Australian

7 A cape B breath C mane D mate

8 A crazy B pen C scent D stretch

9 A fate B leather C paid D date

10 A member B pray C tender D November