Giá trị của x trong biểu thức x4=6−12\dfrac{x}{4} = \dfrac{6}{- 12}4x=−126 là:
Cách 1:
x4=6−123x12=−6123x12=−612123x=12−63x=−6\dfrac{x}{4} = \dfrac{6}{- 12} 3 x 12 = - 6 12 \dfrac{3x}{12} = \dfrac{- 6}{12} 12 3 x = 12 - 6 3x = - 64x=−1263x12=−612123x=12−6123x=12−63x=−6x=−2x = - 2x=−2
Cách 2:x4=6−12x=4.6−12x=4.6−12x=−124.6x=−2\dfrac{x}{4} = \dfrac{6}{- 12} x = 4.6 - 12 x = \dfrac{4.6}{- 12} x = - 12 4.6 x = - 24x=−126x=4.6−12x=−124.6x=−124.6x=−2
