Question

1 Tìm x

a)115-5.x=25

b)2.(x+3)=10

Answer 1

a) 115-5x=25

115-25=5x

90=5x

x=90/5

x=18

Answer 2

115 - 5x = 25

=> 5x = 90

=> x = 18

vậy_

2(x + 3) = 10

=> x + 3 = 5

=> x = 2

vậy_

Answer 3

\(a.115-5x=25\)

\(\Leftrightarrow5x=90\)

\(\Leftrightarrow x=18\)

\(b.2.\left(x+3\right)=10\)

\(\Leftrightarrow2x+2.3=10\)

\(\Leftrightarrow2x+6=10\)

\(\Leftrightarrow2x=4\)

\(\Leftrightarrow x=-2\)

Answer 4

a)115-5.x=25

5.x=115-25

5.x=90

x=90;5

x=18

Answer 5

b)2.(x+3)=10

x+3=10:2

x+3=5

x=5-3

x=2

Answer 6

a.115 - 5x = 25

            5x = 90

             x = 18

b. 2(x + 3 ) = 10

       x + 3   = 5

       x         = 2

Answer 7

\(115-5x=25\)

\(115-25=5x\)

\(90=5x\)

\(=>18\)