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98764 nhé

1 + 9 + 2 + 8 + 3 + 7

= ( 1 + 9 ) + ( 2 + 8 ) + ( 3 + 7 )

= 10 + 10 + 10

= 10 x 3

= 30

9m2=900dm2

600dm2 = 6 m2

4m2 25dm2 = 425dm2

500cm2 = 5 dm2

3km2 = 3000000m2

5 000 000m2 = 5 km2

Nhớ k ch mình nếu bạn thấy đúng nhé!

Ta có : ( a + b ) + ( a + c ) + ( b + c ) = - 1 + 11 + 2 

<=> ( a + a ) + ( b + b ) + ( c + c ) = 12

<=> 2a + 2b + 2c = 12

<=> 2 ( a + b + c ) = 12

=> a + b + c = 6

=> c = ( a + b + c ) - ( a + b ) = 6 - ( - 1 ) = 7

=> b + c = b + 7 = 2 => b = - 5

=> a + b = a + ( - 5 ) = - 1 => a = - 1 + 5 = 4

Vậy a = 4 ; b = - 5 ; c = 7

1200 nha

x+45=45-45+55:55

x+45=0+1

x+45=1

x=1-45

x=-44

k nhé mk vừa k bn rùi

170+180+190+200+210+220

=(180+220)+(190+210)+200+170

=400+400+200+170

=1170