Toán Lớp 7: 12 x X = 15 x X -15
Rut gon nhat co the
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Toán Lớp 7: 12 x X = 15 x X -15
Rut gon nhat co the
Comments ( 2 )
12.x=15.x-15
⇔ 15.x-12.x=15
⇔ x.(15-12)=15
⇔ x.3=15
⇔ x=5
Vậy x=5
12 × x = 15 × x – 15
12x = 15x – 15
12x – 15x = -15
-3x = -15
x = -15 : (-3)
x = 5
Vậy x = 5