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, x . 9,9 + x : 1 0 = 1 2,5 x. 1 0 9 9 + x. 1 01 = 225 x 1 0 9 9 + 1 01 = 225 x.1 0 = 225 x = 225 :1 0 = 225 . 1 01 = 45 b, x: 41 − x = 578 x.4 − x = 578 x 4 − 1 = 578 x.3 = 578 x = 578 :3 = 578 . 31 = 526 c, x: 1 01 − x:4 − x. 43 = 49 = x.1 0 − x. 41 − x. 43 = 49 x 1 0 − 41 − 43 = 49 x.9 = 49 x = 49 :9 = 49 . 91 = 4

x = 0,25 - 15,6

x = -15,35

Mk cần lời giải nhé !

a)x÷0,25-x=15,6

X×4-x×1=15,6

X×(4-1)=15,6

X=15,6÷3

X=5,2

B)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=2,25÷9

X=1/4

Ban co the chep nhanh len chu minh khong co vip toan nen chi dung duoc mot ngay

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

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

\(x:0,25-x=15,6\)

\(x:\dfrac{1}{4}-x=15,6\)

\(x\text{×}4-x\text{×}1=15,6\)

\(x\text{×}\left(4-1\right)=15,6\)

\(x\text{×}3=15,6\)

\(x=15,6:3\)

\(x=5,2\)

x :0,25 -x=15,6

X x4 -x =15,6

X -1 x4 =15,6

X -4 =15,6 

X=15,6+4

X=19,6

\(\text{X : 0,25 - X = 15,6}\)

\(x:\left(0,25-1\right)=15,6\)

\(x.\left(\frac{-3}{4}\right)=\frac{78}{5}\)

\(x=\frac{78}{5}:\left(\frac{-3}{4}\right)\)

\(x=-20,8\)

chúc bạn học tốt

\(x\div0,25-x=15,6\)

\(\Leftrightarrow\)\(x\div\frac{1}{4}-x=15,6\)

\(\Leftrightarrow\)\(x\times4-x=15,6\)

\(\Leftrightarrow\)\(x\times\left(4-1\right)=15,6\)

\(\Leftrightarrow\)\(x\times3=15,6\)

\(\Leftrightarrow\)\(x=15,6\div3\)

\(\Leftrightarrow\)\(x=5,2\)

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

\(x:0,25-x=15,6\)

\(\Leftrightarrow4x-x=15,6\)

\(\Leftrightarrow x\left(4-1\right)=15,6\)

\(\Leftrightarrow3x=15,6\)

\(\Leftrightarrow x=5,2\)

Trả lời:

\(x:0,25-x=15,6\)

\(\Leftrightarrow4x-x=15,6\)

\(\Leftrightarrow3x=15,6\)

\(\Leftrightarrow x=5,2\)

Vậy\(x=5,2\)

Hok tốt!

Good girl

= (4x0,25)x15,6

= 1x15,6

=15,6

4 x 15,6 x 0,25

\(=\left(4\times0,25\right)\times15,6=1\times15,6=15,6\)