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a, 43-121+18-x+49+11 = 37-51+28
=> -x= 14
=> x= -14 Vậy x=-14
b, 113-47-33+20=31-25-x+5
=> 53= 11-x
=>x=11-53=-42. Vậy x= -42
giải
a) ( 43-121+18) - ( X-49 -11)= 37- (51-28)
-60 - X + 60 = 37 - 23
-X = 14 => X= -14
b) 113-(47+33-20)=(31-25)-(X+5)
113 - 60 = 9 - X - 5
53 = 4 - X
53 - 4 = - X
49 = -X => X= -49
a) 12+(2x-11)=53
(2x-11) = 53-12
2x-11= 41
2x=41+11
2x=52
x= 52:2
x=26
Vậy...
\(b,21-\left(-6+3x\right)=9\)
\(\Rightarrow21+6-3x=9\)
\(\Rightarrow27-3x=9\)
\(\Rightarrow3x=18\)
\(\Rightarrow x=6\)
c, -(2x+4)+11=-27
=>-2x-4+11=-27
=>-2x+7=-27
=>-2x = -34
=>x=17
d, 33-(33-x)=0
=>33-33+x=0
=>x=0
Giải :
a) x + ( x + 1 ) + ( x + 2 ) + ... + ( x + 50 ) = 2040
=> 51x + ( 1 + 2 + 3 + ... + 50 ) = 2040
=> 51x + ( 50 + 1 ) . 50 : 2 = 2040
=> 51x + 1275 = 2040
=> 51x = 765
=> x = 15
b) 1 + 2 + 3 + ... + x = 300
=> ( x + 1 ) . x : 2 = 300
=> ( x + 1 ) . x = 600
=> ( x + 1 ) . x = 25 . 24
=> x = 24
1,
a,\(2020-\left(249+2020\right)+\left(249-573\right)\)
\(=2020-249-2020+249-573\)
\(=-573\)
b,\(\left|-257\right|+\left(-3\right)^0-\left(18+257\right)\)
\(=257+1-18-257\)
\(=1-18=-17\)
\(c,25.\left(85-47\right)-85.\left(47+25\right)\)
\(=25.85-25.47-47.85+85.25\)
\(=85.\left(25-47+25\right)-25.47\)
\(=85.3-25.47\)
\(=-920\)
2,
\(a,15-5.\left(x+2\right)=-30\)
\(=>5.\left(x+2\right)=15+30=45\)
\(=>x+2=\frac{45}{5}=9\)
\(=>x=7\)
\(b,\left(x+2\right)^2+5=105\)
\(=>\left(x+2\right)^2=100\)
\(=>\left(x+2\right)^2=10^2\)
\(=>x+2=10\)
\(=>x=8\)
\(c,\left|2x-5\right|-\left(-6\right)=11\)
\(=>\left|2x-5\right|=11-6=5\)
\(=>\orbr{\begin{cases}2x-5=5\\2x-5=-5\end{cases}}\)
\(=>\orbr{\begin{cases}2x=5-5=0\\2x=-5+5=0\end{cases}=>x=0}\)
e: =>-40+3+33+40-x=47
=>36-x=47
=>x=-11
f: =>x(x-3)(11-x)(11+x)=0
hay \(x\in\left\{0;3;11;-11\right\}\)
g: =>-62-38-x+2x=-100
=>x-100=-100
hay x=0
\(\left[2040:\left(47-3x\right)+33\right].11=1683\)
\(\Leftrightarrow2040:\left(47-3x\right)+33=153\)
\(\Leftrightarrow2040\left(47-3x\right)=120\)
\(\Leftrightarrow47-3x=17\)
\(\Leftrightarrow3x=30\Leftrightarrow x=10\)
Em cảm ơn