a. 3x-2=2x-3
<=> 3x-2x=2-3
<=> x=-1
Vậy S={-1}
b. 3-4y+24+6y=y+27+3y
<=> -4y+6y-y-3y=27-3-24
<=> -2y=0
<=> y=0
Vậy S={0}
c. 7-2x=22-3x
<=> -2x+3x=22-7
<=> x=15.
Vậy S={15}
d. 8x-3=5x+12
<=> 8x-5x=3+12
<=> 3x=15
<=> x=5.
Vậy S={5}
e. x-12+4x=25+2x-1
<=> x+4x-2x=25-1+12
<=> 3x=36
<=> x=12.
Vậy S={12}
f. x+2x+3x-19=3x+5
<=> x+2x+3x-3x=19+5
<=> 3x=24
<=> x=8
Vậy S={8}
a, \(3x-2=2x-3\)
\(\Rightarrow3x-2x=-3+2\)
\(\Leftrightarrow x=-1\)
b,\(3-4y+24+6y=y+27+3y\)
\(\Rightarrow-4y+6y-y-3y=27-3-24\)
\(\Leftrightarrow-2y=0\Leftrightarrow y=0\)
c,\(7-2x=22-3x\)
\(\Rightarrow-2x+3x=22-7\)
\(\Leftrightarrow x=15\)
Chúc bạn học tốt!!!
Câu trả lời:
a) 3x - 2 = 2x-3
<=> 3x-2 -2x +3 = 0
<=> x +1 = 0
<=> x = -1
b) 3 - 4y+24+6y=y+27+3y
<=> 3 - 4y+24+6y - y - 27 - 3y = 0
<=> -2y =0
<=> y = 0
c)7-2x = 22 - 3x
<=> 7-2x -22 +3x = 0
<=> -15 +x = 0
<=> x = 15
d) 8x-3=5x+12
<=> 8x-3-5x-12 = 0
<=>3x -15 = 0
<=> 3x = 15
<=> x = 5
e) x-12+4x = 25+2x-1
<=> x-12+4x -25-2x+1=0
<=> 3x -36 = 0
<=> 3x = 36
<=> x = 12
f ) x +2x+3x-19=3x+5
<=> x +2x+3x-19- 3x-5 = 0
<=>3x -24 = 0
<=> 3x = 24
<=> x = 8
d, \(8x-3=5x+12\)
\(\Rightarrow8x-5x=12+3\)
\(\Leftrightarrow3x=15\Leftrightarrow x=5\)
e,\(x-12+4x=25+2x-1\)
\(\Rightarrow x+4x-2x=25-1+12\)
\(\Leftrightarrow3x=36\Leftrightarrow x=12\)
f,\(x+2x+3x-19=3x+5\)
\(\Rightarrow x+2x+3x-3x=5+19\)
\(\Leftrightarrow3x=24\Leftrightarrow x=8\)
Chúc bạn học tốt!!!
đề yêu cầu là đưa về dạng ax +b = 0 mà mấy bạn