Question

B. (x-21 x 13) : 11=30

C.(25-x) + (29-x) +(33-x) +....+ (101-x) = 128

TÌM X

 

Answer 1

Ta có:

B. ( x - 21.13 ) : 11 = 30

=> x = 30 x 11 + 21 x 13

=> x = 330 + 273

=> x = 603

C. ( 25 - x ) + ( 29 - x ) + ( 33 - x ) + ... + ( 101 - x ) = 128

=> ( 25 + 29 + 33 + ... + 101 ) - ( x + x + x +...+ x ) = 128

=> 1260 - 20x = 128

=> 20x = 1260 - 128

=> x = 1132 : 20

=> x = 283/5

Answer 2

B. ( x - 21.13 ) : 11 = 30

=> x = 30 x 11 + 21 x 13

=> x = 330 + 273

=> x = 603

C. ( 25 - x ) + ( 29 - x ) + ( 33 - x ) + ... + ( 101 - x ) = 128

=> ( 25 + 29 + 33 + ... + 101 ) - ( x + x + x +...+ x ) = 128

=> 1260 - 20x = 128

=> 20x = 1260 - 128

=> x = 1132 : 20

=> x = 283/5

Answer 3

283/5

Answer 4

283/5

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