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Đáp án:
17x-28=12x-(-42)
17x-28=12x+42
17x-12x=42+28
5x=70
x=70/5
x=14.
Chúc bạn học tốt^^
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Bài làm
17x - 28 = 12x - ( -42 )
=> 17x - 28 = 12x + 42
=> 17x - 12x = 42 + 28
=> 5x = 70
=> x = 14
Vậy x = 14
\(17x-28=12x-\left(-42\right)\)
\(17x-28=12x+42\)
\(17x-12x=42+28\)
\(5x=70\)
\(x=14\)
Vậy \(x=14\)
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Ngu!
17x-28=12x-(-42)
17x-28=12x+42
5x-28=42
5x=24+42
5x=70
x=70/5
x=14
![](https://rs.olm.vn/images/avt/0.png?1311)
a)102-(x-3)=43
=>100-(x-3)=64
=>x-3=100-64
=>x-3=36
=>x=36+3
=>x=39
b)252-(17x+82)=152+132
=>625-(17x+82)=225+132
=>625-(17x+82)=375
=>17x+82=625-375
=>17x+82=250
=>17x=250-82
=>17x=168
=>x=168:17
=>x=168/17
c)202-(282-12x)=62
=>40-(784-12x)=36
=>784-12x=40-36=4
=>12x=784-4=780
=>x=780:12=65
![](https://rs.olm.vn/images/avt/0.png?1311)
\(15x+3-4x=17x-12x+43\)
\(\Leftrightarrow15x-4x+3=x\left(17-12\right)+43\)
\(\Leftrightarrow x\left(15-4\right)+3=5x+43\)
\(\Leftrightarrow11x+3=5x+43\)
\(\Leftrightarrow6x=40\)
\(\Leftrightarrow x=40\div6\)
\(\Leftrightarrow x=\frac{40}{6}\)
\(\Leftrightarrow x=\frac{20}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x-[ 42+(-28)]=-28
x-42-28=-28
x-42=-28+28
x-42=0
x=0+42
x=42
dễ ri mà là toán lớp 6 à
trả lời nhanh hộ mk vs
17x - 29 = 12x - (-42 )
17x - 12x = 29 - ( -42 )
5x = 29 + 42
5x = 71
x = 71 : 5
x = \(\frac{71}{5}\)