= 152+14,2

= 166,2

=166,2
Tick cho mình nha Nguyen Thi Xuan Tinh
 

Lời giải:
$(1,43:0,01+15,6:0,1)\times 1,3$

$=(1,43\times 100+15,6\times 10)\times 1,3$

$=(143+156)\times 1,3=299\times 1,3=(300-1)\times 1,3$

$=300\times 1,3-1,3=390-1,3=388,7$

(1,43:0,01 + 15,6 x 0,1) x 1,3

= (1,43 x 100 + 15,6 x 10) x 1,3

= (143 + 156) x 1,3

= 300 x 1,3

= 390

Mk cần lời giải nhé !

câu 2:

(5,1+12,9)+(6,4+11,6)+(7,7+10,3)+(9+14,5)

=18+18+18+23,5

=18*3+23,5

=54+23,5

=77,5

96 4 là sao

X : 0,25 - X = 15,6

X × 4 - X = 15,6

X × (4 - 1) = 15,6

X × 3 = 15,6

X = 15,6 : 3

X = 5,2

--------

X : 0,1 - X : 4 - X × 3/4 = 2,25

X × 10 - X × 1/4 - X × 3/4 = 2,25

X × (10 - 1/4 - 3/4) = 2,25

X × 9 = 2,25

X = 2,25 : 9

X = 0,25

a, x . 9,9 + x : 10 = 12,5

\(x.\frac{99}{10}+x.\frac{1}{10}=\frac{25}{2}\)

\(x\left(\frac{99}{10}+\frac{1}{10}\right)=\frac{25}{2}\)

\(x.10=\frac{25}{2}\)

\(x=\frac{25}{2}:10=\frac{25}{2}.\frac{1}{10}=\frac{5}{4}\)

b, \(x:\frac{1}{4}-x=\frac{78}{5}\)

\(x.4-x=\frac{78}{5}\)

\(x\left(4-1\right)=\frac{78}{5}\)

\(x.3=\frac{78}{5}\)

\(x=\frac{78}{5}:3=\frac{78}{5}.\frac{1}{3}=\frac{26}{5}\)

c, \(x:\frac{1}{10}-x:4-x.\frac{3}{4}=\frac{9}{4}\)

\(=x.10-x.\frac{1}{4}-x.\frac{3}{4}=\frac{9}{4}\)

\(x\left(10-\frac{1}{4}-\frac{3}{4}\right)=\frac{9}{4}\)

\(x.9=\frac{9}{4}\)

\(x=\frac{9}{4}:9=\frac{9}{4}.\frac{1}{9}=\frac{1}{4}\)

**** 

a) \(210:x=2,1:0,25=8,4\)

\(x=210:8,4=25\)

b) \(x.2+x.0,5=6,25\)

\(2,5x=6,25\)

\(x=6,25:2,5=2,5\)

c) \(x:0,25-x=15,6\)

\(3x=15,6\)

\(x=5,2\)

d) \(x:12,5=3,75.4=15\)

\(x=15.12,5=187,5\)

e) \(x.12,6-x.5,6=42\)

\(7x=42\)

\(x=6\)

g) \(x:0,1-x:4-x.0,75=2,25\)

\(10x-\dfrac{x}{4}-\dfrac{3x}{4}=2,25\)

\(9x=2,25\)

\(x=0,25\)

giúp mình gấp mn

a , x : 0,25 - x =15,6

    x x 4 - x      = 15,6

   x x ( 4-1)     = 15,6

  x x 3            = 15,6

        x           = 15,6: 3

        x           = 5,2

Mấy con kia làm tương tự như con a

**** nhe

x.4/25=16/5