Tìm x:
a) X x 23 – X x 13 = 220
b) X x 7 + X x 2 + X = 210500
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\(a,1337+13\times x=6745\\ \Rightarrow13\times x=6745-1337\\ \Rightarrow x=5408:13\\ \Rightarrow x=416\\ b,142\times x-41\times x-x=408000\\ \Rightarrow x\times\left(142-41-1\right)=408000\\ \Rightarrow x\times100=408000\\ \Rightarrow x=408000:100\\ \Rightarrow x=4080\)
a. 1337 + 13 x x = 6745
13 x x = 6745-1337
13 x x = 5408
x = 5408 : 13
x = 416
b. 142 x x – 41 x x – x = 408000
142 x x – 41 x x – x x 1 = 408000
(142-41-1) x x = 408 000
100 x x = 408000
x = 408 000:100
x = 4080
a) (x + 5) + (x + 6) + (x + 7) + (x + 8) = 58
x+5+x+6+x+7+x+8=58
4x+(5+6+7+8)=58
4x+26=58
4x=58-26=32
x=32:4=8
b) X x 27 + X x30 + X x 43 = 210500
X x (27+30+43)=210500
X x 100=210500
X=210500:100
X=2105
b) x.27+x.30+x.43 =210500
=>x(27+30+43)=210500
x.100=210500
x=210500:100=2105
a: \(x\left(x+7\right)-\left(x-2\right)\left(x+3\right)=0\)
\(\Leftrightarrow x^2+7x-x^2-x+6=0\)
hay x=-1
b: Ta có: \(\left(x+2\right)^2-\left(x^2-4\right)=0\)
\(\Leftrightarrow x+2=0\)
hay x=-2
b. (x + 2)2 - x2 + 4 = 0
<=> (x + 2 - x)(x + 2 + x) + 4 = 0
<=> 2(2 + 2x) + 4 = 0
<=> 4(1 + x) + 4 = 0
<=> 4(1 + x) = -4
<=> 1 + x = -1
<=> x = -1 - 1
<=> x = -2
\(a,x=\dfrac{13}{2}-2\\ x=\dfrac{9}{2}\\ b,x=\dfrac{4}{5}\times\dfrac{3}{4}\\ x=\dfrac{12}{20}=\dfrac{3}{5}\)
X x ( 27 + 30 +43 ) = 210500
X x 100 = 210500
X = 210500 : 100
X = 2105
X x (27 +30+43) =210500
X x 100 = 210500
X =210500 : 100
X = 215
a) 23x-13x=220
x(23-13)=220
10x=220
x=220:10=22
b)7x+2x+x=210500
x(7+2+1)=210500
10x=210500
x=210500:10=21050
a) X x ( 23 -13) =220
X x 10 = 220
X = 220 : 10
X = 22
b) X x ( 7+2+1)=210500
X x 10 = 210500
X = 210500 : 10
X = 21050