Toán Lớp 6: -(x-7)+38=-2x+76
1-(3-2x)=-3+8x
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Toán Lớp 6: -(x-7)+38=-2x+76
1-(3-2x)=-3+8x
Comments ( 2 )
Answer
– (x – 7) + 38 = -2x + 76
=> -x + 7 + 38 = -2x + 76
=> -x + 7 + 38 + 2x – 76 = 0
=> (-x + 2x) + (7 + 38 – 76) = 0
=> x + (45 – 76) = 0
=> x – 31 = 0
=> x = 0 + 31
=> x = 31
Vậy x = 31
________________________
1 – (3 – 2x) = -3 + 8x
=> 1 – 3 + 2x = -3 + 8x
=> 1 – 3 + 2x + 3 – 8x = 0
=> (2x – 8x) + (1 – 3 + 3) = 0
=> -6x + (-2 + 3) = 0
=> -6x + 1 = 0
=> -6x = 0 – 1
=> -6x = -1
=> x = (-1) : (-6)
=> x = 1/6
Vậy x = 1/6
1) -(x-7)+38=-2x+76
<=> -x+7+38=-2x+76
<=>-x+2x=76-7-38
<=> x=31
Vậy S={31}
2) 1-(3-2x)=-3+8x
<=> 1-3+2x=-3+8x
<=> 2x-8x=-3-1+3
<=> -6x=-1
<=> x=1/6
Vậy S={1/6}