a: =>6,5x=18,5

hay x=185/65=37/13

b: =>x=43,2:3,6=12

12

1,56 x X = X x 263

=> 263 x X - 1,56 x X =0

=> X(263-1,56)=0

=> X x 261,44 =0

=> X = 0: 261,44

=> X =0

ths! bạn nhiều

a)  8,8 : 2,5 + 7,6 : 2,5 - 6,4 : 2,5

= (8,8 + 7,6 - 6,4) : 2,5

= 10 : 2,5

= 4

\(a.\)

\(8.8:2.5+7.6:2.5-6.4:2.5\)

\(=\left(8.8+7.6-6.4\right):2.5\)

\(=10:2.5\)

\(=4\)

\(b.\)

\(0.25\times1200+125\times1.5\times2-250\times2.6\)

\(=250\times1.2+250\times1.5-250\times2.6\)

\(=250\times\left(1.2+1.5-2.6\right)\)

\(=250\times0.1=25\)

\(c.\)

\(\left(32\times11-3200\times0.1-32\right):\left(81.6\times27.3-17.3\times81.6\right)\)

\(=\left[32\times\left(11-10-1\right)\right]:\left[81.6\times\left(27.3-17.3\right)\right]\)

\(=0\)

a,\(\Rightarrow x:3=1,56+7,2\)

   \(\Rightarrow x:3=8,76\)

\(\Rightarrow x=8,76\cdot3\)

\(\Rightarrow x=26,28\)

b,\(\Rightarrow x:6=1,248:4\)

\(\Rightarrow x:6=0,312\)

\(\Rightarrow x=0,312\cdot6\)

\(\Rightarrow x=1,872\)

c,(x+x+x+x+...+x)+(2+5+8+....+29)=165

    10 số hạng           10 số hạng

\(\Rightarrow\)10x+(29+2)*10:2=165

\(\Rightarrow\)10x+155=165

\(\Rightarrow10x=165-155\)

\(\Rightarrow10x=10\)

\(\Rightarrow x=10:10\)

\(\Rightarrow x=1\)

Lời giải.

a.

$58.10,6-x.17,3-x=530,62$
$614,8-x.(17,3+1)=530,62$
$x.18,3=614,8-530,62=84,18$

$x=84,18:18,3=4,6$
b.

$600,7-102,5:x+14,52:x=592,4$

$600,7-(102,5-14,52):x=592,4$

$600,7-87,98:x=592,4$

$87,98:x=600,7-592,4=8,3$

$x=87,98:8,3=10,6$

c. Bạn xem lại đề.

X : 3 = 1,56 : 72

X : 3 = 73,56

X = 73,56 x 3

X = 220,68

Tk mk nha

x : 3 = 1,56 + 72 

x : 3 = 73,56

x = 73,56 x 3 

x = 220,68

nhớ k

x : 3 - 72 = 1,56

x : 3       = 1,56 + 72

x : 3       = 73,56

x            = 73,56 x 3

x            = 220,68