78 x \(x\) + \(x\)+ \(x\)=4000

(78 +1+1) x \(x\)=4000

80 x \(x\)=4000

\(x\)=4000:80

\(x\)=50

78.x+x+x=80.50

x.(78+1+1)=4000

x.80=4000

     x=4000:80

     x=50

\(\left(78+1+1\right)\times x=4000\)

\(80\times x=4000\)

\(x=4000:80\)

\(x=50\)

là 50 nhé ban

x+78x+25x-4x=78,6+121,4

100x=200

x=2

Vậy x=2

x+78x+25x-4x=200

100x=200

x=200:100

x=2 

các bn viết rõ đc ko

600 × x = 78 x 31 + 78 × 24 + 78 × 17 + 22 × 72

600 × x = 78 × (31 + 24 + 17) + 22 × 72

600 × x = 78 × 72 + 22 × 72

600 × x = 72 × (78 + 22)

600 × x = 72 × 100

600 × x = 7200

x = 7200 : 600

x = 12

Vậy x = 12

 Dấu \("."\)là dấu nhân nhé !!! 

\(x+78.x+25.x-x.4=7,6+121,4\)

\(\Rightarrow x.1+78.x+25.x-x.4=200\)

\(\Rightarrow x.\left(1+78+25-4\right)=200\)

\(\Rightarrow x.100=200\)

\(\Rightarrow x=200:100\)

\(\Rightarrow x=2\)

Vậy \(x=2\)

Chúc bạn học tốt !!! 

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

các bạn ơi 4x và 3x là j vậy ??

\(60x=80x-5\)
\(60x-80x=-5\)
\(-20x=-5\)
\(x=\dfrac{-5}{-20}=\dfrac{1}{4}\)

\(78\times2\div x=39\)

\(\Leftrightarrow156\div x=39\)

\(\Leftrightarrow x=4\)

x=4 nha

x=4 nha

\(x:0,2+x:0,125-x\cdot3=78\)

\(=>x:\left(0,2:0,125\cdot3\right)=78\)

\(=>x:4,8=78\)

\(=>x=374,4\)

\(\cdot\)là nhân nha

ti ck mik cầu xin đó

####

\(x:0,2+x:0,125-x3=78\)

\(x.5+x.8-x.3=78\)

\(x\left(5+8-3\right)=78\)

\(x.10=78\)

\(\Leftrightarrow x=7,8\)

X : 0,2 + X : 0,125 - 3X = 78

\(\Rightarrow X:\frac{1}{5}+X:\frac{1}{8}-3X=78\)

\(\Rightarrow5X+8X-3X=78\)

\(\Rightarrow10X=78\Rightarrow X=7,8\)