124xy=4829-365   

124 x y = 4464

y=4464:124

y=36

2652:y=26

y=2652:26

y=102

124y = 4464

y = 4464 : 124

y = 36

--------------------------

2652 : y = 26

y = 2652 : 26

y = 102

a) 4 829 - 124  x y = 365

=> 124 x y = 4 829 - 365 = 4 464

=> y = 4 464 : 124 = 36

Vậy y = 36

b) 2 652 : y = 13 x 2

=> 2 652 : y = 26

=> y = 2 652 : 26 

=> y = 102

Vậy y = 102

124 * y = 4829 - 365

124 * y =  4464

         y = 4464 :124

         y = 36

k mình nhaaaaaaaaaaaa!

124 x y=4829-365

124 x y=4464

y=4464:124

y=36

1,

a, \(x\)x 124= 4829-365

 \(x\)x 124 = 4464

\(x\)= 4464 :124

\(x\)= 36.

b,\(x\)x 137 = 25 x 3 

   \(x\)x 137 = 75

\(x\)= \(\frac{75}{137}\)

2,

\(\frac{4}{5}\)x\(\frac{3}{7}+\frac{4}{5}\)x\(\frac{6}{7}-\frac{4}{5}\)x\(\frac{4}{10}\)

=\(\frac{4}{5}\)x\(\left(\frac{3}{7}+\frac{6}{7}-\frac{4}{10}\right)\)=\(\frac{4}{5}\)x\(\frac{31}{35}\)\(\frac{124}{175}\)

\(\text{Bài }1\text{ : Tìm }x\text{ : }\)

\(a,\text{ }x\text{ x }124=4829-365\)

     \(x\text{ x }124=4464\)

     \(x=4464\text{ : }124\)

     \(x=36\)

\(b,\text{ }x\text{ x }137=25\text{ x }3\)

     \(x\text{ x }137=75\)

     \(x=75\text{ : }137\)

     \(x=\frac{75}{137}\)

\(\text{Bài }2\text{ : Tính bằng cách thuận tiện nhất : }\)

      \(\frac{4}{5}\text{ x }\frac{3}{7}+\frac{4}{5}\text{ x }\frac{6}{7}-\frac{4}{5}\text{ x }\frac{4}{10}\)

\(=\frac{4}{5}\text{ x }\left(\frac{3}{7}+\frac{6}{7}-\frac{4}{10}\right)\)

\(=\frac{4}{5}\text{ x }\left(\frac{9}{7}-\frac{4}{10}\right)\)

\(=\frac{4}{5}\text{ x }\frac{31}{35}\)

\(=\frac{124}{175}\)

a) y x 42 + y x 57 + y = 25 400

y x ( 42 + 57 + 1 ) = 25 400

y x 100 = 25 400

y = 25 400 : 100

y = 254

b) 142 x y - 41 x y - y = 408 000

y x ( 142 - 41 - 1 ) = 408 000

y x 100 = 408 000

y = 408 000 : 100

y = 4 080

a.y*(42+57+1)=25400

y*100=25400

y=25400:100=254

b.(142-41-1)*y=408000

100*y=408000

y=408000:100=4080

\(2652:y=36\)

            \(y=2652:36\)

            \(y=73,6666.......\)

2652:y=36

y=2652:36

y=221/3

a. x – 7182 = 3408

x = 3408 + 7182  

x = 10590   

b. 6235 – x = 4829

x = 6235 – 4829

x = 1406

a. x - 7182 =3408

                x =3408+7182

                x =10590

b. 6235 - x = 4829

               x =6235 -4829

               x =1406

\(a)\)

\(y\times15-y\times25+y\times15=3780-255\)

\(y\times15-y\times25+y\times15=3525\)

\(y\times\left(15-25+15\right)=3525\)

\(y\times5=3525\)

\(y=3525:5\)

\(y=705\)

\(b)\)

\(341 + 448 : y - 141 = 214\)

\(341 + 448 : y = 214+141\)

\(341 + 448 : y = 355\)

\(448:y=355-341\)

\(448:y=14\)

\(y=448:14\)

\(y=32\)

\(y:5\times6=985+532\\ \Rightarrow y:5\times6=1517\\ \Rightarrow y:5=1517:6\\ \Rightarrow y:5=\dfrac{1517}{6}\\ \Rightarrow y=\dfrac{1517}{6}\times5\\ \Rightarrow y=\dfrac{7585}{6}\)