Tìm x
a. \(2x+12-18=x+4-18\) ( quy tắc chuyển vế)
b. \(-5x+10-102=-6x-102\)
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a) -18-(x-6)=0
x-6=(-18)-0
x-6=-18
x = (-18)+6
x = -12
b) 29-(10+29)=x-(27-9)
29-39 = x-18
-10 =x-18
x-18=-10
x = (-10)+18
x = 8
Học tốt
a/ => 2 - x = 22 => x = -20
b/ => x - 12 = -24 => x = -12
c/ => 11 - 26 = x - 16
=> -15 = x - 16
=> x = 1
d/ => 5x - x - 2 + 6x - 10 = 0
=> 10x - 12 = 0
=> 10x = 12
=> x = 1,2
a) \(3x-10=2x+13\Leftrightarrow x=13+10=23\)
b) \(x+12=-5-x\Leftrightarrow2x=-17\Leftrightarrow x=-\frac{17}{2}\)
c) \(x+5=10-x\Leftrightarrow2x=5\Leftrightarrow x=\frac{5}{2}\)
d) \(6x+23=2x-12\Leftrightarrow4x=-35\Leftrightarrow x=-\frac{35}{4}\)
e) \(12-x=x+1\Leftrightarrow2x=11\Leftrightarrow x=\frac{11}{2}\)
f) \(14+4x=3x+20\Leftrightarrow x=20-14=6\)
g) \(2\left(x-1\right)+3\left(x-2\right)=x-4\Leftrightarrow2x-2+3x-6=x-4\)
\(\Leftrightarrow5x-8=x-4\Leftrightarrow4x=4\Leftrightarrow x=1\)
h ) \(3\left(4-x\right)-2\left(x-1\right)=x+20\Leftrightarrow12-3x-2x+2=x+20\)
\(\Leftrightarrow14-5x=x+20\Leftrightarrow6x=-6\Leftrightarrow x=-1\)
i ) \(4\left(2x+7\right)-3\left(3x-2\right)=24\Leftrightarrow8x+28-9x+6=24\)
\(\Leftrightarrow34-x=24\Leftrightarrow x=34-24=10\)
k) \(3\left(x-2\right)+2x=10\Leftrightarrow3x-6+2x=5x-6=10\)
\(\Leftrightarrow5x=10+6=16\Leftrightarrow x=\frac{16}{5}\)
Tự KL cho các phần
a) \(\Rightarrow72-20x-36x+84=30x-240-6x-84\)
\(\Rightarrow80x=480\Rightarrow x=6\)
b) \(\Rightarrow15x+25-8x+12=5x+6x+36+1\)
\(\Rightarrow4x=0\Rightarrow x=0\)
c) \(\Rightarrow10x-16-12x+15=12x-16+11\)
\(\Rightarrow14x=4\Rightarrow x=\dfrac{2}{7}\)
a) -84 - (-18 - 6) = x + (-20)
-84 + 18 + 6 = x - 20
-84 + 18 + 6 + 20 = x
=> x = -40
\(-84-\left(-18-6\right)=x+\left(-20\right)\)
\(\Leftrightarrow x=\left(-20\right)+84+\left(-18-6\right)\)
\(\Leftrightarrow x=40\)
P/s tham khảo nha
A)
\(-14-7+x=-12\)
\(\Leftrightarrow x=-12+7+14\)
\(\Leftrightarrow x=9\)
P/s tham khảo nha
a,\(2x+12-18=x+4-18\)
\(\Rightarrow2x-x=4-1+18-12\)
\(\Rightarrow x=9\)
b,\(-5x+10-102=-6x-102\)
\(\Rightarrow-5x+6x=-102+102-10\)
\(\Rightarrow x=-10\)
a, 2x + 12 - 18 = x + 4 - 18
2x -x = 4 - 18 - 12 + 18
x = - 8
b, - 5x + 10 - 102 = - 6x - 102
- 5x + 6x = -102 - 10 + 102
x = - 10
VERY GOOD!!!