\(\Leftrightarrow3x\left(x-10\right)=60x-60\left(x-10\right)\)

\(\Leftrightarrow3x\left(x-10\right)=600\)

\(\Leftrightarrow x^2-10x-200=0\)

=>(x-20)(x+10)=0

=>x=20 hoặc x=-10

\(\dfrac{60}{x-10}-\dfrac{60}{x}=\dfrac{3}{10}\)đk : x khác 10 ; 0 

\(\Leftrightarrow600x-600\left(x-10\right)=3x\left(x-10\right)\)

\(\Leftrightarrow3x^2-30x-6000=0\Leftrightarrow x=50;x=-40\left(tm\right)\)

Đáp số x=-40 em nhé, lúc nãy anh nhầm dạng =)

đk : x khác 10 ; 0 

\(\Rightarrow600x-600\left(x-10\right)=3x\left(x-10\right)\)

\(\Leftrightarrow6000=3x^2-30x\Leftrightarrow x^2-10x-2000=0\Leftrightarrow x=50;x=-40\)(tm)

20 + 60 + 50 + 80 + 90 + 10 + 50 + 60 x 10

= (20 + 80) + (50 + 50 ) + (90 + 10 ) + 600 + 60

=     100     +      100     +      100     + 660

=              960

=(20+80)+(50+50)+(90+10)+(60*10)+60

=100+100+100+600+60

=960

20 + 60 + 50 + 80 + 90 + 10 + 50 + 60 x 10

= 20 + 60 + 50 + 80 + 90 + 10 + 50 + 600

= ( 20 + 80 ) + ( 50 + 50 ) + ( 90 + 10 ) + 60 + 600

= 100 + 100 + 100 + 60 + 600

= 100 . 3 + 660

= 300 + 660

= 960

Bài làm

( 10 + 20 + 30 + ..... + 900 ) x ( 60 x 1 - 60 )

= ( 10 + 20 + 30 + ...... + 900 ) x ( 60 - 60 )

= ( 10 + 20 + 30 + ...... + 900 ) x 0

= 0

Kết quả =0

Hok tốt !

Xin tk !

=(10+20+30+...+900) x(60-60)

=(10+20+30+...+900)x0

=0

D

D

D

60+2.5=60+10=70

9.10+10=90+10=100

chuc bn hoc gioi!

nhae

~~~~~~

60+2x5=70

9x10+10=100

60+2x5

=60+10

=70

90x10+10

=900+10

=910

k nha bn

40 x 10 + 60 x 10

=10.(40+60)

=10.100

=1 000

40 x 10 + 60 x 10

= (40 + 60) x 10

=    100 x 10

=  1000

40 x 10 + 60 x 10

= ( 40 + 60 ) x 10

= 100 x 10

= 1000

x = 10 ( bớt 2 vế đi 60 )

60+10=60+x

70=60+x

70-60=x

x=10

Vậy x=10

60 + 10 = 60 + x 

70 = 60 + x

Ta đổi vế cho dễ nhìn:

60 + x = 70

x = 70 - 60

x = 10