Question

2.25.9+{[2.125-(5x+4).5]:(4.3.5)]}=453

kien thuc lop 6 do nha ai lam dc like cho

 

Answer 1

2.25.9 + {[ 2.125 - ( 5x + 4 ).5 ] : ( 4.3.5 )]} = 453

= 2.25.9 +  250 - ( 5x + 4 ).5 ] : 12.5  = 453 

= 50.9 + [ 250 - ( 5x + 4 ).5 ] : 60 = 453

= 450 + 250 - ( 5x + 4 ).5  = 453.60

= 450 + 250 - ( 5x + 4 ) = 453 : 5

= 450 + 250 - ( 5x + 4 ) = 90,6

=  450 +  250 - 5x = 90,6 - 4

= 450 + 250 - 5x = 86,6

= 700 - 5x = 86,6

= 86,6 + 700

= 5x = 786,6

= 786,6 : 5

= 157,32

Answer 2

2.25.9 + {[ 2.125 - ( 5x + 4 ).5 ] : ( 4.3.5 )]} = 453

= 2.25.9 +  250 - ( 5x + 4 ).5 ] : 12.5  = 453 

= 50.9 + [ 250 - ( 5x + 4 ).5 ] : 60 = 453

= 450 + 250 - ( 5x + 4 ).5  = 453.60

= 450 + 250 - ( 5x + 4 ) = 453 : 5

= 450 + 250 - ( 5x + 4 ) = 90,6

=  450 +  250 - 5x = 90,6 - 4

= 450 + 250 - 5x = 86,6

= 700 - 5x = 86,6

= 86,6 + 700

= 5x = 786,6

= 786,6 : 5

= 157,32

Answer : 157,32