Tìm X , biết
( - 15 ) + x = ( - 14 ) - ( - 57 )
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\(x+13=32-76\)
\(\Leftrightarrow x+13=-44\)
\(\Leftrightarrow x=-44-13\)
\(\Leftrightarrow x=-57\)
\(-15+x=-14-\left(-57\right)\)
\(\Leftrightarrow-15+x=-14+57\)
\(\Leftrightarrow-15+x=43\)
\(\Leftrightarrow x=43+15=58\)
a) − 2 5 + 1 6 + − 1 5 ≤ x < − 3 4 + 9 7 + − 1 4 + 5 7 ⇔ − 13 30 ≤ x ≤ 1 ⇔ x ∈ 0 ; 1
b) 5 17 + − 4 9 + 12 17 < x ≤ − 3 7 + 7 15 + 4 − 7 + 8 15 + 9 3 ⇔ 5 9 < x ≤ 3 ⇔ x ∈ 1 ; 2 ; 3
1, -15 + \(x\) = -14 - (-57)
-15 + \(x\) = -14 + 57
\(x\) = -14 + 57 + 15
\(x\) = 43 + 15
\(x\) = 58
2, (-14) + \(x\) - 7 = -10
-14 + \(x\) - 7 = -10
- 21 + \(x\) = - 10
\(x\) = -10 + 21
\(x\) = 11
a, -15 + \(x\) = -14 - (-57)
-15 + \(x\) = -14 + 57
\(x\) = -14 + 57 + 15
\(x\) = 58
b, (-14) + \(x\) - 7 = -10
\(x\) = -10 + 7 + 14
\(x\) = -3 + 14
\(x\) = 11
c) \(\left(34-2x\right)\left(2x-6\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}34-2x=0\\2x-6-0\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}2x=34\\2x=6\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=17\\x=3\end{matrix}\right.\)
d) \(\left(2019-x\right)\left(3x-12\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}2019-x=0\\3x-12=0\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=2019\\3x=12\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=2019\\x=4\end{matrix}\right.\)
e) \(57\left(9x-27\right)=0\)
\(\Rightarrow9x-27=0\)
\(\Rightarrow9\left(x-3\right)=0\)
\(\Rightarrow x-3=0\)
\(\Rightarrow x=3\)
f) \(25+\left(15-x\right)=30\)
\(\Rightarrow25+15-x=30\)
\(\Rightarrow40-x=30\)
\(\Rightarrow x=40-30\)
\(\Rightarrow x=10\)
g) \(43-\left(24-x\right)=20\)
\(\Rightarrow43-24+x=20\)
\(\Rightarrow19+x=20\)
\(\Rightarrow x=20-19\)
\(\Rightarrow x=1\)
h) \(2\left(x-5\right)-17=25\)
\(\Rightarrow2\left(x-5\right)=17+25\)
\(\Rightarrow x-5=21\)
\(\Rightarrow x=21+5\)
\(\Rightarrow x=26\)
i) \(3\left(x+7\right)-15=27\)
\(\Rightarrow3\left(x+7\right)=27+15\)
\(\Rightarrow x+7=14\)
\(\Rightarrow x=14-7\)
\(\Rightarrow x=7\)
j) \(15+4\left(x-2\right)=95\)
\(\Rightarrow4\left(x-2\right)=95-15\)
\(\Rightarrow4\left(x-2\right)=80\)
\(\Rightarrow x-2=20\)
\(\Rightarrow x=20+2\)
\(\Rightarrow x=22\)
k) \(20-\left(x+14\right)=5\)
\(\Rightarrow x+14=20-5\)
\(\Rightarrow x+14=15\)
\(\Rightarrow x=15-14\)
\(\Rightarrow x=1\)
l) \(14+3\left(5-x\right)=27\)
\(\Rightarrow3\left(5-x\right)=27-14\)
\(\Rightarrow3\left(5-x\right)=13\)
\(\Rightarrow5-x=\dfrac{13}{3}\)
\(\Rightarrow x=5-\dfrac{13}{3}\)
\(\Rightarrow x=\dfrac{2}{3}\)
a) x+13 = 32 -76
x+13 = -44
x = -44 -13
x = -57
=> x = -57
b) (-15)+x = (-14)-(-57)
(-15) +x = 43
x = 43 -(-15)
x =58
=> x = 58
tic nhé
a) x+13=32-76
x+13=-44
x=(-44)-13
x=-57
b)(-15)+x=(-14)-(-57)
(-15)+x=43
x=43-(-15)
x=58
a) x + 13 = 32 - 76
=> x + 13 = -44
=> x = (-44) - 13
=> x = -57
b) ( -15) + x = ( -14 ) - ( -57 )
=> (-15) + x = (-14) + 57
=> (-15) + x = 43
=> x = 43 - (-15)
=> x = 43 + 15
=> x = 58
Tìm x
a) x+13=32-76
x+13= -44
x= -44-13
x= -57
b) (-15)+x=(-14)-(-57)
(-15)+x= (-14)+57
(-15)+x= 43
x= 43-(-15)
x=43+15
x=58
x + (-23 ) = -100 + 77
x + ( -23 ) = -23
x = -23 - ( -23 )
x = -23 + 23
x = 0
( -15 ) + x = ( -14 ) - ( -57 )
( -15 ) + x = 43
x = 43 - ( -15 )
x = 43 + 15
x = 58
Mấy câu còn lại cũng dễ bn tự làm nha! Bye bye
\(x+\left(-23\right)=-100+77\)
\(\Leftrightarrow x-23=-23\)
\(\Leftrightarrow x=-23+23\)
\(\Leftrightarrow x=0\)
\(-15+x=-14-\left(-57\right)\)
\(\Leftrightarrow-15+x=43\)
\(\Leftrightarrow x=43+15\)
\(\Leftrightarrow x=48\)
\(11-\left(15+11\right)=x-\left(25-9\right)\)
\(\Leftrightarrow11-26=x-16\)
\(\Leftrightarrow x-16=15\)
\(\Leftrightarrow x=-15+16\)
\(\Leftrightarrow x=1\)
\(x-\left(17-x\right)=x-7\)
\(\Leftrightarrow x-17+x=x-7\)
\(\Leftrightarrow2x+17=x-7\)
\(\Leftrightarrow x-2x=7-17\)
\(\Leftrightarrow-x=-10\)
\(\Leftrightarrow x=10\)
\(\left(-12\right)^{2x}=56+10.13x\)
\(\Leftrightarrow144^x=56+10.13x\)
(-15) + x = (-14) - (-57)
(-15) + x = 43
x = 43 - ( -15 )
x = 58
Vậy x = 58
Ai nhanh mik k nhé tks mọi người :)