Question

Tìm X

( 5 x X -15 ) : 5 = 0

84 - 4 x ( 2 x X + 1 ) = 48 

15 x X - 2009 = 1201

[ 43 - ( 56 - X ) ] x 12 = 384

 

Answer 1

\(a,\)\(\left(5x-15\right)\div5=0\)

\(\Rightarrow x-3=0\)

\(\Rightarrow x=3\)

Answer 2

\(b,\)\(84-4\left(2x+1\right)=48\)

\(\Rightarrow84-8x-4=48\)

\(\Rightarrow8x=32\)

\(\Rightarrow x=4\)

Answer 3

\(\left(5\times x-15\right):5=0\)

=> \(5\times x-15=0\)

=> \(5\times x=15\)

=> \(x=3\)

\(84-4\times\left(2\times x+1\right)=48\)

=> \(4\times\left(2\times x+1\right)=84-48\)

=> \(4\times\left(2\times x+1\right)=36\)

=> \(2\times x+1=9\)

=> \(2\times x=9-1\)

=>  \(2\times x=8\)

=> \(x=4\)

Answer 4

a, \(\left(5x-15\right):5=0\)

\(5x-15=0\)

\(5x=15\)

\(x=3\)

b, \(84-4\left(2x+1\right)=48\)

\(4\left(2x+1\right)=36\)

\(2x+1=9\)

\(2x=8\)

\(x=4\)

c, \(15x-2009=1201\)

\(15x=3210\)

\(x=214\)

d, \(\left[43-\left(56-x\right)\right]\times12=384\)

\(43-\left(56-x\right)=32\)

\(56-x=11\)

\(x=45\)

Answer 5

\(c,\)\(15x-2009=1201\)

\(\Rightarrow15x=1201+2009\)

\(\Rightarrow15x=3210\)

\(\Rightarrow x=214\)

Answer 6

\(d,\)\(\left[43-\left(56-x\right)\right].12=348\)

\(\Rightarrow43-56+x=32\)

\(\Rightarrow x=45\)

Answer 7

(5 x X - 15) : 5 = 0

(5 x X - 15) = 0 x 5 

5 x X - 15 = 0

5 x X = 0 + 15

5 x X = 15

x = 15 : 5

x = 3

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Answer 8

84 - 4 x (2 x X + 1) = 48

       4 x (2 x X + 1) = 84 - 48

       4 x (2 x X + 1) = 36

             (2 x X + 1) = 36 : 4

              2 x X + 1 = 9

              2 x X = 9 - 1

              2 x X = 8

                   X = 8 : 2 

                   X = 4

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Answer 9

15 x X - 2009 = 1201

15 x X             = 1201 + 2009

15 x X             = 3210

       X              = 3210 : 15

       X              = 214

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Answer 10

[ 43 - ( 56 - X ) ] x 12 = 384

[ 43 - ( 56 - X ) ] = 384 : 12

 43 - ( 56 - X )  = 32

         (56 - X) = 43 - 32

          56 - X = 11

                 X = 56 - 11

                 X = 45

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Answer 11

\(5\)\(\times\)\(x\)\(-\)\(2009\)\(=\)\(1201\)

​\(\Rightarrow5\times x=\)\(1201+2009\)

\(\text{​​}\Rightarrow5\times x=3210\)

\(\Rightarrow x=3210\div5\)

\(\Rightarrow x=642\)

\(\left[43-\left(56-x\right)\right]\times12=384\)

\(\Rightarrow43-\left(56-x\right)=384\div12\)

\(\Rightarrow43-\left(56-x\right)=32\)

\(\Rightarrow56-x=43-32\)

\(\Rightarrow56-x=11\)

\(\Rightarrow x=56-11\)

\(\Rightarrow x=45\)

Answer 12

\(\left(5x-15\right):5=0\)

\(\Rightarrow5x-15=0\)

\(\Rightarrow5x=15\)

\(\Rightarrow x=3\)