( -x+6 ) nhân ( -x-2 )
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Tham khảo:
b)
c)
7 x 4 + 3 x 4 = (7 + 3) x 4
= 10 x 4
= 40
12 x 2 + 4 x 2 + 4 x 2 = (12 + 4 + 4) x 2
= 20 x 2
= 40
=> x . ( 2 + 3 + 4 + 5 + 6 ) = x . 9 + 9999
=> x . 20 = x . 9 + 9999
=> x . 11 = 9999 ( cùng bớt x + 9 )
=> x = 9999 : 11
=> 909
2x + 3x + 4x + 20x + 6x = 9x + 9999
35x - 9x = 9999
26x = 9999
x = 9999 / 26
Vậy : x = 9999 / 26
1.53x201=10653
2.
a)4 xX-15x4=6x15+X
<=>4x-60=90+x
<=>4x-x=60+90
<=>3x=150
<=>x=50
b(102+28-2x):20-5=1
<=>(130-2x):20=6
<=>130-2x=120
<=>2x=10
<=>x=5
c)1999x-x=1999+1997+1999
<=>1998x=5995
<=>\(x\approx3\)
d)105-5x=150:15
<=>105-5x=10
<=>5x=95
<=>x=19
e)(x+1)+(x+2)+(x+3)+...+(x+6)=78
<=>6x+21=78
<=>6x=57
<=>x=9,5
1) 53x201=53x200+53=10600+53=10653
2a)
4x-15x4=6x15+x
4x-60=90+x
4x-x=90+60
3x=150
x=50
b) x=5
c) x=3
d)x=19
e) x=9,5
\(x\times2+x\times4+x\times6+...+x\times18+x\times20=440\)
\(\Rightarrow x\times\left(2+4+6+...+18+20\right)=440\)
\(\Rightarrow x\times110=440\)
\(\Rightarrow x=440\div110\)
\(\Rightarrow x=4\)
Vậy : \(x=4\)
x*2+x*4+x*6+.....+x*18+x*20=440
x*(2+4+6+...+18+20)=440
Có
4-2=6-4=...=20-18=2
số liền trước hơn số liền sau 2 đơn vị
SSH là :(20-2):2+1=10
tổng là : (20+2)*10:2=110
thay vào ta có :
x*110=440
x=440 : 110
x=4
vậy x=4
a, \(3\left(x-1\right)-\left(2x+3\right)=5\)
\(\Rightarrow3x-3-2x-3=5\)
\(\Rightarrow x-6=5\)
\(\Rightarrow x=11\)
b, \(\frac{6}{13}=\frac{x}{7}\)
\(\Rightarrow x=\frac{6}{13}.7\)
\(\Rightarrow x=\frac{42}{13}\)
c, \(|x|=4\)
\(\Rightarrow x=4\)hoặc \(x=-4\)
d,, \(|x-2|+5=10\)
\(Th1:x-2>0\)
\(\Rightarrow x-2+5=10\)
\(\Rightarrow x+3=10\)
\(\Rightarrow x=7\)
\(Th2;x-2< 0\)
\(\Rightarrow2-x+5=10\)
\(\Rightarrow7-x=10\)
\(\Rightarrow x=-3\)
e, \(3|x-1|-6=9\)
\(Th1:x-1>0\)
\(\Rightarrow3\left(x-1\right)-6=9\)
\(\Rightarrow3x-3-6=9\)
\(\Rightarrow3x-9=9\)
\(\Rightarrow3x=18\)
\(\Rightarrow x=6\)
\(Th2:x-1< 0\)
\(\Rightarrow3\left(1-x\right)-6=9\)
\(\Rightarrow3-3x-6=9\)
\(\Rightarrow-3x-3=9\)
\(\Rightarrow-3x=12\)
\(\Rightarrow x=-4\)
\(5.\left(x+35\right)=515\)
\(x+35=515:5\)
\(x+35=103\)
\(x=103-35\)
\(\Rightarrow x=68\)
\(\left(x+40\right).15=75.12\)
\(\Rightarrow\left(x+40\right)=5.12\)[ rút gọn theo t/c đẳng thức ]
\(x+40=60\)
\(x=20\)
\(3\left(x-\dfrac{1}{6}\right)-2\left(x-\dfrac{1}{3}\right)=\dfrac{2}{3}\)
\(\Leftrightarrow3x-\dfrac{1}{2}-2x+\dfrac{2}{3}=\dfrac{2}{3}\)
\(\Leftrightarrow x=\dfrac{1}{2}\)
Vậy \(x=\dfrac{1}{2}\)