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-13x = 39
x = 39 : -13
x = -3
Vậy x = -3
Ủng hộ nhé ! Bấm Đúng nếu thấy mình trả lời đúng !
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\(104-4.\left(x-150\right)=48\)
\(=>4.\left(x-150\right)=104-48\)
\(=>4.\left(x-150\right)=56\)
\(=>x-150=56:4\)
\(=>x-150=14\)
\(=>x=14+150\)
\(=>x=164\)
_________________
\(\left(13x+39\right)-65=26.4^0\)
\(=>\left(13x+39\right)-65=26.1=26\)
\(=>13x+39=26+65\)
\(=>13x+39=91\)
\(=>13x=91-39\)
\(=>13x=52\)
\(=>x=52:13\)
\(=>x=4\)
a) 104.4.(x-150) = 48
4.(x-150) = 104 - 48
4. (x-150) = 56
x-150 = 56 : 4
x-150 = 14
x = 14 + 150
x = 164
![](https://rs.olm.vn/images/avt/0.png?1311)
a) -13x = 39
=> x = 39 : (-13)
x= -3
b) 2x - (-17) = 15
=> 2x = 15 + (-17)
2x = -2
x = -1
c) -7-2x = 37-(-24)
-7-2x = 61
2x = -7-61
2x = -68
x = -34
d) -2.(2x+1) = -5.(x+1)
-4x - 2 = -5x - 5
=> -4x + 5x = -5 + 2
x = -3
![](https://rs.olm.vn/images/avt/0.png?1311)
a) -13x=39
x=39:(-13)
x= -3
Vậy x= -3
b) 2x-(-17)=15
2x+17=15
2x=15-17
2x= -2
x= -2:2
x=-1
Vậy x=-1
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
a.
$21\times 23-3\times 7\times (-17)$
$=21\times 23-21\times (-17)$
$=21\times 23+21\times 17=21\times (23+17)=21\times 40$
$=840$
b.
$42\times 3-7\times [(-34)+18]$
$=7\times 18-7\times (-16)$
$=7\times 18+7\times 16=7\times (18+16)=7\times 34=238$
c.
$=142\times 32+32\times (-7)-13\times 32$
$=32\times (142-7-32)=32\times 103=3296$
d.
$=13\times [(23-17)-(23+17)]$
$=13\times (23-17-23-17)=13\times (-34)=-442$
![](https://rs.olm.vn/images/avt/0.png?1311)
13x - 130 = 65
=> 13x = 65 + 130
=> 13x = 195
=> x = 195 : 13
=> x = 15
Vậy x = 15
suy ra x=39:(-13)
suy ra x=-3
nhớ bấm đúng cho mình nha
Do -13x=39 => x=39/(-13)=-3.
Vậy x=-3