tìm x (2x-5)+17=6 10-2(4-3x)=-4 -12+3(-x+7)=-18 24:(3x-2)=-3 -45:5.(-3-2x)=3 27/10/2021 Bởi Melody tìm x (2x-5)+17=6 10-2(4-3x)=-4 -12+3(-x+7)=-18 24:(3x-2)=-3 -45:5.(-3-2x)=3
Đáp án + Giải thích các bước giải: (2x – 5) + 17 = 6 => 2x – 5 + 17 = 6 => 2x – 5 = 6 – 17 => 2x – 5 = -11 => 2x = -11 + 5 => 2x = -6 => x = -3 10 – 2(4 – 3x) = -4 => 2(4 – 3x) = 10 – (-4) => 2(4 – 3x) = 14 => 4 – 3x = 7 => 3x = 4 – 7 => 3x = -3 => x = -1 -12 + 3(-x + 7) = -18 => 3(-x + 7) = -18 – (-12) => 3(-x + 7) = -18 + 12 => 3(-x + 7) = -6 => -x + 7 = -2 => -x = -2 – 7 = -9 => x = 9 24 : (3x – 2) = -3 => 3x – 2 = 24 : (-3) => 3x – 2 = -8 => 3x = -8 + 2 => 3x = -6 => x = -2 -45 : 5(-3 – 2x) = 3 => 5(-3 – 2x) = -45 : 3 => 5(-3 – 2x) = -15 => -3 – 2x = -3 => 2x = -3 – (-3) => 2x = -3 + 3 => 2x = 0 => x = 0 Bình luận
Đáp án: (2x-5)+17=6 => 2x-5+17=6 => 2x+12 = 6 => 2x=6-12 => 2x=-6 => x=(-6)/2=-3 10-2(4-3x)=-4 => 10-8+6x=-4 => 2+6x=-4 => 6x = -4-2=-6 => x=-6/6=-1 -12+3(-x+7)=-18 => -12-3x+21=-18 => -3x+9=-18 => -3x =-18-9 => x = (-27):(-3)=9 -45:5.(-3-2x)=3 => -45:5.(-3-2x)=3 => -9.(-3-2x)=3 => 27+18x=3 => 18x=3-27=-24 => x=-24:18=-(4/3) Bình luận
Đáp án + Giải thích các bước giải:
(2x – 5) + 17 = 6
=> 2x – 5 + 17 = 6
=> 2x – 5 = 6 – 17
=> 2x – 5 = -11
=> 2x = -11 + 5
=> 2x = -6
=> x = -3
10 – 2(4 – 3x) = -4
=> 2(4 – 3x) = 10 – (-4)
=> 2(4 – 3x) = 14
=> 4 – 3x = 7
=> 3x = 4 – 7
=> 3x = -3
=> x = -1
-12 + 3(-x + 7) = -18
=> 3(-x + 7) = -18 – (-12)
=> 3(-x + 7) = -18 + 12
=> 3(-x + 7) = -6
=> -x + 7 = -2
=> -x = -2 – 7 = -9
=> x = 9
24 : (3x – 2) = -3
=> 3x – 2 = 24 : (-3)
=> 3x – 2 = -8
=> 3x = -8 + 2
=> 3x = -6
=> x = -2
-45 : 5(-3 – 2x) = 3
=> 5(-3 – 2x) = -45 : 3
=> 5(-3 – 2x) = -15
=> -3 – 2x = -3
=> 2x = -3 – (-3)
=> 2x = -3 + 3
=> 2x = 0 => x = 0
Đáp án:
(2x-5)+17=6
=> 2x-5+17=6
=> 2x+12 = 6
=> 2x=6-12
=> 2x=-6
=> x=(-6)/2=-3
10-2(4-3x)=-4
=> 10-8+6x=-4
=> 2+6x=-4
=> 6x = -4-2=-6
=> x=-6/6=-1
-12+3(-x+7)=-18
=> -12-3x+21=-18
=> -3x+9=-18
=> -3x =-18-9
=> x = (-27):(-3)=9
-45:5.(-3-2x)=3
=> -45:5.(-3-2x)=3
=> -9.(-3-2x)=3
=> 27+18x=3
=> 18x=3-27=-24
=> x=-24:18=-(4/3)