Toán Lớp 6: -7 . (3.x -5)+2 . (7.x-14)
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Toán Lớp 6: -7 . (3.x -5)+2 . (7.x-14)
giúp mình đi mà, bị bơ hoài ák
Comments ( 1 )
– 7(3x – 5) + 2(7x – 14)
<=> – 21x + 35 + 14x – 28
<=> – 21x + 14x + 35 – 28
<=> – 7x + 7 = 0
<=> – 7x = – 7
<=> x = 1
KL: Vậy x = 1
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