Question

tính giá trị của biểu thức

X+5+Y+5+X+5+Y+5

với x+y=20

Answer 1

\(x+5+y+5+x+5+y+5.\)

\(=\left(x+y+x+y\right)+\left(5+5+5+5\right)\)

\(=\left(20+20\right)+20\)

\(=40+20\)

\(=60\)

Answer 2

X x 2 + Y x 2 + 25

2 x 20 + 25

= 65

Answer 3

x + 5 + y + 5 + x + 5 + y + 5

= ( x + y ) + ( x + y ) + 5 + 5 + 5 + 5

= 20 + 20 + 5 + 5 + 5 + 5

= 20 x 2 + 5 x 4

= 40 + 20

= 60

Answer 4

x + 5 + y + 5 + x + 5 + y + 5

= ( x + y ) + ( x + y ) + 5 + 5 + 5 + 5

= 20 + 20 + 5 . 4

= 40 + 20

= 60

Answer 5

\(x+5+y+5+x+5+y+5\)

\(=\left(x+y+x+y\right)+\left(5+5+5+5\right)\)

\(=40+20\)

\(=60\)

Answer 6

x + 5 + y + 5 + x + 5 + y + 5

= ( x + y ) + ( x + y ) + 5 + 5 + 5 + 5

= 20 + 20 + 5 . 4

= 40 + 20

= 60