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a)
5.(12-x)-20=30
⇒60-5x-20=30
⇒-5x=30+20-60
⇒-5x=-10
⇒x=2
b)(17x - 25 ) : 8 + 65 = 92
(17x - 25 ) : 8 + 65 = 81
17x - 25 = 16 x 8 = 128
17x = 128+25=153
x= 153:17 =9
c)
x=23
Giải thích các bước giải:
3x – 10 = 2x + 13
3x-2x=13+10
x=23
d)4(2x+7)-3(3x-2)=24
4.2x+4.7-3.3x+3.2=24
8x+28-9x+6=24
8x-9x=24-28-6=-10
=>(-1)x=-10
x=-10:(-1)
x=10
a. \(5\cdot\left(12-x\right)-20=30\Leftrightarrow5\left(12-x\right)=50\)
\(\Leftrightarrow12-x=50:5=10\)
\(\Leftrightarrow x=12-10=2\)
b. \(\left(17x-25\right):8+65=9^2\)
\(\Leftrightarrow\left(17x-25\right):8=81-65=16\)
\(\Leftrightarrow17x-25=16:8=2\)
\(\Leftrightarrow17x=2+25=27\Leftrightarrow x=\frac{27}{17}\)
c. \(3x-10=2x+13\)
\(\Leftrightarrow3x-2x=10+13\)
\(\Leftrightarrow x=23\)
d. \(4\cdot\left(2x+7\right)-3\cdot\left(3x-2\right)=24\)
\(\Leftrightarrow8x+28-9x+6=24\)
\(\Leftrightarrow34-x=24\Leftrightarrow x=10\)
1) 11 - x = 8 - ( -11 )
11 - x = 19
x = 11 - 19
x = -8
2) x - 21 = ( -7 ) - 4
x - 21 = -11
x = ( -11 ) + 21
x = 10
3) 46 - x = -21 + ( -87 )
46 - x = -108
x = 46 - ( -108 )
x = 154
1)11-x=8+11
11-x=19
x=11-19
x=-8
2)Mk ko bt
3)46-x=-108
x=46-(-108)
x=46+108
x=154
4) x-96=443-x-15
x-96=443-15-x
x-96=428-x
x+x=428=96
2x+524
x=524:2
x=262
5) Mk ko bt
Mk chỉ bt 3 câu này thui bạn ak
Ta có: x - 2/4 = 5 + x/3
x = (5 + x/3) + 2/4
x= x
x là: 5 - 3 = 2 ; 4 - 2 = 2
Vậy x là 2.
Không chắc đâu nha!
x - 2/4 = 5 + x/3
=> x - 2/4 = 5 + x.1/3
=> x - x.1/3 = 5 + 2/4
=> x.(1-1/3) = 11/2
=> 2/3.x = 11/2
=> x= 11/2 : 2/3
=> x = 33/4
-12(x-5)+7(3-x)=5
=> -12x+60+21-7x=5
=> -19x+81=5
=>-19x=5-81
=>-19x=-76
=>x=4
Vậy x=4
a) X - 36 x 18 = 12
X - 36 = 12 : 18
X - 36 = 2/3
X = 2/3 + 36
X = \(36\frac{2}{3}\)
b) ( X - 36 ) : 18 = 12
X - 36 = 12 x 18
X - 38 = 216
X = 216 + 38
X = 254
\(\frac{4}{5}\)+ \(\frac{1}{5}\): \(\frac{-2}{15}\)= \(\frac{4}{5}\)+ \(\frac{1}{5}\)* \(\frac{-15}{2}\)=\(\frac{4}{5}\) + \(\frac{-3}{2}\)= \(\frac{-7}{10}\)
b = \(\frac{-7}{12}\). (\(\frac{3}{11}\)+ \(\frac{-14}{11}\)) + \(\frac{5}{6}\)= \(\frac{-7}{12}\). (-1) + \(\frac{5}{6}\)= \(\frac{7}{12}\)+ \(\frac{10}{12}\)= \(\frac{17}{12}\)
-12(x-5)+7(3-x)=5
-12x - (-60) + 21 - 7x = 5
- (12x+7x) + (60+21) = 5
-19x + 81 = 5
-19x = 5 - 81
-19x = -76
x = -76 : (-19)
x = 4
Ta có \(-12.\left(x-5\right)+7.\left(3-x\right)=5\)
\(\Rightarrow-12x+60+21-21x=5\)
\(\Rightarrow\left(-12x-21x\right)+\left(60+21\right)=5\)
\(\Rightarrow-33x+81=5\)
\(\Rightarrow-33x=-77\)
\(\Rightarrow x=\frac{7}{3}\)