35 x 18 - 9 x 70 + 135

= 630- 630 + 135

=     0        + 135

=     135

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

\(=0+2020=2020\)

2020

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

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 ) 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!

Kết quả là:0

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

= (35 x 18 - 9 x 35 x 2) x 2010 x 2011 x ... x 2020

= ( 35 x 18 - 18 x 35 ) x 2010 x 2011 x ... x 2020

= 35 x (18 - 18 ) x 2010 x 2011 x ... x 2020

= 35 x 0 x 2010 x 2011 x ... x 2020 

= 0 x 2010 x 2011 x ... x 2020 

= 0

a, 

\(135\cdot57+135\cdot86-35\cdot143\)  

\(=135\cdot\left(57+86\right)-35\cdot143\)  

\(=135\cdot143-35\cdot143\) 

\(=143\cdot\left(135-35\right)\) 

\(=135\cdot100\) 

\(=13500\) 

b, 

\(91\cdot47+49\cdot53-18\cdot47+24\cdot53\) 

\(=91\cdot47-18\cdot47+49\cdot53+24\cdot53\) 

\(=47\cdot\left(91-18\right)+53\cdot\left(49+24\right)\) 

\(=47\cdot73+53\cdot73\) 

\(=73\cdot\left(47+53\right)\) 

\(=73\cdot100\) 

\(=7300\)   

chịu

gg

=2020

2020