ta có : x=2010

->x-1=2009

A(x)=x²⁰¹⁰-(x-1).x²⁰⁰⁹ -(x-1).x²⁰⁰⁸ -...-(x-1).x+1

A(x)=x²⁰¹⁰-x²⁰¹⁰+x²⁰⁰⁹-x²⁰⁰⁹+x²⁰⁰⁸-...-x²+x+1

A(x)=x+1=2010+1=2011

Cảm ơn

\(\frac{2}{3}\times\frac{1}{5}+\frac{3}{10}\times\frac{2}{3}+\frac{4}{6}\times\frac{1}{2}\)

\(=\frac{2}{3}\times\frac{1}{5}+\frac{3}{10}\times\frac{2}{3}+\frac{2}{3}\times\frac{1}{2}\)

\(=\frac{2}{3}\times\left(\frac{1}{5}+\frac{3}{10}+\frac{1}{2}\right)\)

\(=\frac{2}{3}\times\frac{10}{10}\)

\(=\frac{2}{3}\)

1/ ab +  ac =a(b+c)

2/ ab - ac + ad=a(b-c+d)

3/ ax - bx - cx + dx=x(a-b-c+d)

4/ a(b+c) - d (b+c)=(b+c)(a-d)

5/ ac - ad + bc - bd=(a+b)(c-d)

6/ ax + by + bx + ay=(a+b)(x+y)

1/a(b+c)

2/a(b-c+d)

3/x(a-b-c+d)

4/(b+c)(a-d)

5/a(c-d)+b(c-d)=(a+b)(c-d)

6/a(x+y)+b(x+y)=(a+b)(x+y)

1, ab+ac=a(b+c)

2,ab-ac+ad=a(b-c+d)

3,ax-bx-cx+dx=x(a-b-c+d)

4,a(b+c)-d(b+c)=(b+c)(a-d)

5,ac-ad+bc-bd=a(c-d)+b(c-d)=(a+b)(c-d)

6,ax+by+bx+ay=a(x+y)+b(x+y)=(a+b)(x+y)

2/3×3/4×4/5÷1/5=2

2/5×3/4×5/6÷3/4=0.33333333333......

2/3 x 3/4 x 4/5 : 1/5 = 6/12 x 4/5 :1/5 = 24/60 :1/5 = 4/10 : 1/5 = 4/10 x 5/1 = 20/10 = 2

2/5 x 3/4 x 5/6 : 3/4 = 6/20 x 5/6 : 3/4 = 3/10 x 5/6  : 3/4 = 15/60 : 3/4 = 1/4 : 3/4 = 1/4 x 4/3 = 4/12 = 1/3

k cho mk nha!

\(\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}\div\frac{1}{5}\)

\(=\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}\times\frac{5}{1}\)

\(=\frac{2\times3\times4\times5}{3\times4\times5\times1}\)

\(=\frac{2}{1}\)

\(=2\)

 A=149 nho h cho minh nhe!