\(=9\times\left(70-70\right)+2020\)

\(=0+2020=2020\)

2020

\(=9\times70-35\times2\times9+2020\)

\(=9\times\left(70-70\right)+2020=0+2020=2020\)

( 35 x 18 - 9 x 70 ) x 2010 x 2011 x 2012 x ... x 2020

= 0 x 2010 x 2011 x 2012 x ... x 2020

= 0 nha !

(35*18-9*70)*2010*2011*.....*2020

=(630-630)*2010*........*2020

=0*2010*.........*2020

=0

CHÚC BẠN HỌC TỐT!

=2020

2020

=2020

Bài ni t mần cho phát chán nó  rồi:))

Ta có:\(x^{2012}+y^{2012}=\left(x^{2011}+y^{2011}\right)\left(a+b\right)-ab\left(a^{2010}+b^{2010}\right)\left(1\right)\)

Mặt khác:\(x^{100}+y^{100}=x^{101}+y^{101}=x^{102}+y^{102}\left(2\right)\)

Từ \(\left(1\right);\left(2\right)\Rightarrow1=x+y-xy\)

\(\Rightarrow\left(x-1\right)\left(y-1\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}x=1\Rightarrow1+y^{2010}=1+y^{2011}=1+y^{2012}\Rightarrow y=1\\y=1\Rightarrow x^{2010}+1=x^{2011}+1=x^{2012}+1\Rightarrow x=1\end{cases}}\)vì \(x;y\) là các số dương

Thay vào ta được:\(A=1^{2020}+1^{2020}=2\)

Làm lại nha.sơ suất quá:((

Ta có:

\(x^{2012}+y^{2012}=\left(x^{2011}+y^{2011}\right)\left(x+y\right)-xy\left(x^{2010}+y^{201}\right)\left(1\right)\)

Mặt khác:\(x^{2010}+y^{2010}=x^{2011}+y^{2011}=x^{2012}+y^{2012}\left(2\right)\)

Từ (1);(2) suy ra:

\(x^{2010}+y^{2010}=\left(x^{2010}+y^{2010}\right)\left(x+y\right)-xy\left(x^{2010}+y^{2010}\right)\)

\(=\left(x^{2010}+y^{2010}\right)\left(x+y-xy\right)\)

\(\Rightarrow x+y-xy=1\)

\(\Rightarrow\left(x-1\right)\left(y-1\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}x=1\Rightarrow1+y^{2010}=1+y^{2011}=1+y^{2012}\Rightarrow y=1\\y=1\Rightarrow1+x^{2010}=1+x^{2011}=1+x^{2012}\Rightarrow x=1\end{cases}}\)

Thay vào ta được \(A=3\)

Vậy A=3

35 x 18 - 9 x 70 + 100 

= 70 x 9 - 9 x 70 + 100

=         0            + 100

=        100

35 x 18 - 9 x 70 + 100

= 35 x 2 x 9 - 9 x 70 + 100

= 70 x 9 - 9 x 70 + 100

= (70 - 70) x 9 + 100

= 0 x 9 + 100

= 100

640 nha

35 x 18 - 9 x 70 + 100

= 35 x 2 x 9 - 9 x 70 + 100

= 70 x 9 - 9 x 70 + 100

= 0 + 100

= 100

Tính nhanh : 

35 × 18 - 9 × 70 + 100

= 35 × ( 2 × 9 ) - 9 × 70 + 100

= 35 × 2 × 9 - 9 × 70 + 100

= ( 35 × 2 ) × 9 - 9 × 70 + 100

= 70 × 9 - 9 × 70 + 100

= 9 × ( 70 - 70 ) + 100

= 9 × 0 + 100

= 0 + 100

= 100

 35 X 18 - 9 X 70 + 100

= 35 X 2 X 9 - 9 X 70 + 100

= 70 X 9 - 9 X 70 + 100

= 70 X (9 - 9) + 100

= 70 X 0 + 100

= 0 + 100

= 100

Tk cho mình nha ae!!!!!!!!!!!!! Ai tk mình thì mình tk lại.

a, 2010 x 3+ 2010 x 6 + 2010

= 2010 x ( 3 + 6 + 1)

= 2010 x 10

= 20100

b, 2011 x 89 + 10 x 2011 + 2011

= 2011 x (89 + 10 + 1)

= 2011 x 100

= 201100

a, 2011 x 3+ 2011 x 6 + 2011

= 2011 x ( 3+6+1)

= 2011 x 10

= 20110

b, 2010 x 89 + 10 x 2010 + 2010

= 2010 x (89+10+1)

= 2010 x 100

= 201000