a)480:x+124:x =4

(480+124):x=4

604:x=4

x=604:4

x=151

b)327:x-112:x=5

(327-112):x=5

215:x=5

x=215:5

x=43

a) 480 : x + 124 : x = 4
x : ( 480 + 124 ) = 4
x : 604 = 4
x = 2416
b) 327 : x - 112 : x = 5
x : ( 327 - 112 ) = 5
x : 215 : 5
x = 1075

a.\(y:\dfrac{4}{5}=\dfrac{11}{8}\)

\(y=\dfrac{11}{8}\times\dfrac{4}{5}\)

\(y=\dfrac{11}{10}\)

b.\(\dfrac{11}{3}-y=\dfrac{1}{9}\)

\(y=\dfrac{11}{3}-\dfrac{1}{9}\)

\(y=\dfrac{32}{9}\)

c.\(\dfrac{1}{7}\times x=\dfrac{8}{5}\)

\(x=\dfrac{8}{5}:\dfrac{1}{7}\)

\(x=\dfrac{56}{5}\)

\(y=\dfrac{11}{8}.\dfrac{4}{5}\)

\(y=\dfrac{44}{40}\)

\(x=\dfrac{11}{3}-\dfrac{1}{9}\)

\(x=\dfrac{99-3}{27}=\dfrac{96}{27}\)

\(x=\dfrac{8}{5}:\dfrac{1}{7}\)

\(x=\dfrac{56}{5}\)

a)\(y=\dfrac{4}{5}\times\dfrac{11}{8}=\dfrac{44}{40}=1\dfrac{4}{40}\)

b)\(y=\dfrac{11}{3}-\dfrac{1}{9}=\dfrac{33}{9}-\dfrac{1}{9}=\dfrac{32}{9}\)

c)\(x=\dfrac{8}{5}\times7=\dfrac{56}{5}\)

`4/7 xx x -2/3=1/5`

`=> 4/7 xx x = 1/5+2/3`

`=> 4/7 xx x = 3/15 +10/15`

`=> 4/7 xx x =13/15`

`=> x= 13/15 : 4/7`

`=> x=13/15 xx 7/4`

`=> x= 91/60`

`4/7xx` `x-2/3=1/5`

`7/7xx` `x=3/15+10/15`

`4/7xx` `x=13/15`

`x=13/15:4/7`

`x=13/15xx4/7`

`x=91/60`

Vậy `x=91/60`

`@Nae`

\(x-\dfrac{3}{5}=\dfrac{2}{3}\times\dfrac{1}{5}\\ \Rightarrow x-\dfrac{3}{5}=\dfrac{2}{15}\\ \Rightarrow x=\dfrac{2}{15}+\dfrac{3}{5}\\ \Rightarrow x=\dfrac{2}{15}+\dfrac{9}{15}\\ \Rightarrow x=\dfrac{11}{15}\)

=>x-3/5=2/15

hay x=11/15

x-3/5=2/3 x1/5

x-3/5=2/15

x=2/15+3/5

x=2/15+9/15

x=11/15

a: a*5<1

=>\(a< \dfrac{1}{5}\)

=>a<0,2

b: \(a\cdot6< 20\)

=>\(a< \dfrac{20}{6}\)

=>\(a< \dfrac{10}{3}\)

c: \(250:a< 5\)

=>\(a>\dfrac{250}{5}=50\)

a/ Tất cả \(x\in Z;x\ge0\)

b/ Không có số nguyên x nào thỏa mãn điều kiện.

c/ Tất cả \(x\in Z;x\le0\)

d/ Không có số nguyên x nào thỏa mãn điều kiện.

\(4\left(x-1\right)-3\left(x-2\right)=-5\)

\(\Leftrightarrow4x-4-3x+6=-5\)

\(\Leftrightarrow x=-5+4-6\)

\(\Leftrightarrow x=-7\)

Vậy x=-7

Ta có: 4(x-1) - 3(x-2) = -5

          (4x-4) - (3x-6) = -5

          4x - 4 - 3x + 6 = -5 

     (4x - 3x) + (-4+6) = -5

                       x + 2  = -5

                             x  = -5 - 2

                              x = -7

                         Vậy x = -7

ai giúp với huhu phần thưởng là 1 cái acc Bang bang cho ai trả lời đúng nếu người đó cần