Toán Tìm x thuộc Z: 3 nhân (x+2)-6 nhân(x-5)=2 nhân(5-2x) 13/07/2021 By Samantha Tìm x thuộc Z: 3 nhân (x+2)-6 nhân(x-5)=2 nhân(5-2x)
$3.( x + 2 ) – 6.( x – 5 ) = 2.( 5 -2x)$$3x + 3.2 – 6x + (-6).(-5) = 2.5 – 2.2x$$3x + 6 – 6x + 30 = 10 – 4x$$3x + 4x – 6x = 10 – 6 – 30$ $( 3 + 4 – 6 ).x = -26$$x = -26$ Trả lời
3.(x+2)-6.(x-5)=2.(5-2x)
⇔3x+6-6x+30=10-4x
⇔3x-6x+4x=10-6-30
⇔x=-26
Vậy x=-26.
$3.( x + 2 ) – 6.( x – 5 ) = 2.( 5 -2x)$
$3x + 3.2 – 6x + (-6).(-5) = 2.5 – 2.2x$
$3x + 6 – 6x + 30 = 10 – 4x$
$3x + 4x – 6x = 10 – 6 – 30$
$( 3 + 4 – 6 ).x = -26$
$x = -26$