Tìm x biết I2x+1/3I+3/4=0
tìm x biết
b) 3x - x^3=0
c) (x-1).(x-3)=0
d) Ix+1I + Ix+2I+I2x+3I=2016x
b) ta có: x-1 = 0 => x= 0+1 = 1
x-3 = 0 => x= 0+3 = 3
vậy x =1 và x = 3
b)<=>3x-x3=-x(x2-3)
=>-x(x2-3)=0
Th1:-x=0
Th2:x2-3=0
=>x2=3
=>x=\(\pm\sqrt{3}\)
c)(x-1).(x-3)=0
Th1:x-1=0
=>x=0
Th2:x-3=0
=>x=3
d)Ix+1I + Ix+2I+I2x+3I=2016x
<=>Ix+1I + Ix+2I+I2x+3I=|2x+3|+|x+2|+|x+1|
=>|2x+3|+|x+2|+|x+1|=2016x
=>x\(\approx\)0.00298210735586481
tìm x
a,I2x-1I=x-2
b,I2x+1I=3x
c,I2x+1I=4
d,Ix-3I=1/2
e,Ix+1I+Ix-2I=0
f,I2x-1I+Ix+2I=0
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tìm xa,I2x 1I x 2b,I2x 1I 3xc,I2x 1I 4d,Ix 3I 1 2e,Ix 1I Ix 2I 0f,I2x 1I Ix 2I 0
Tìm x,y biết
a,I2x-1I = Ix+3I
b,IxI+I2y-6I=0
c,Ix-2I>3
d,Ix-7I=x-7
e,I2x+6I-2x-6
tìm x Ix-1/2I + 2 = 3/4 - 4
b) 2- I2x +3I * 3 = -4
a, \(|^{ }_{ }x-\frac{1}{2}|^{ }_{ }=-\frac{13}{4}-2\)
\(|^{ }_{ }x-\frac{1}{2}|^{ }_{ }=-\frac{21}{4}\), mà \(|^{ }_{ }x-\frac{1}{2}|^{ }_{ }\ge0\)
không tìm được x
b,\(|^{ }2x+3|^{ }_{ }\times3=6\)
\(|^{ }_{ }2x+3|=2^{ }_{ }\)
\(\orbr{\begin{cases}2x+3=-2\\2x+3=2\end{cases}}\)
\(\orbr{\begin{cases}x=-\frac{5}{2}\\x=-\frac{1}{2}\end{cases}}\)
TÌM X biết I2x-3I=7/3
tìm giá trị x thỏa mãn I2x+3I + I2x-1I = 8/3(x+1)^2+2
Tìm x biết
a,I5(2x+3)I+I2(2x+3)I+I2x+3I=16
b,Ix+I6x-2II=x^2+4
Tìm x
a, 2 Ix-3I-5=3
b, 2 I2x+3I + I2x+3I=6
c, 3 Ix+1I^2 + Ix+1I^2=16
a ) 2|x - 3| - 5 = 3 <=> 2|x - 3| = 8 <=> |x - 3| = 4 => x - 3 = ± 4
TH1 : x - 3 = 4 => x = 7
TH2 : x - 3 = - 4 => x = - 1
Vậy x = { - 1; 7 }
b ) 2|2x + 3| + |2x + 3| = 6 <=> 3|2x + 3| = 6 => |2x + 3| = 2 => 2x + 3 = ± 2
=> x = { - 5/2 ; - 1/2 }
c ) 3|x + 1|2 + |x + 1|2 = 16
4|x + 1|2 = 16
=> |x + 1|2 = 4 = 22 ( ko xét TH |x + 1| = - 2 vì |x + 1| ≥ 0 )
=> |x + 1| = 2 => x + 1 = ± 2 => x = { - 3; 1 }