Question

me ayudan porfavor plisss


1.-) 2/5x6/7=
2.-) 5/12÷6/8=
3.-) 2x + 5x - 3x=
4.-) y + 2y - 5y=
5.-) -3x + 8x + 12=
6.-) 3y+ 12y - 7y + 2=
7.-) 4x² + 6x² + 3x - 15 + 4x=​

Answer 1

Respuesta:

1 ) 2/5×6/7 = 12/35

2/5×6/7

= (2×6)/(5×7)

= 12/35

2 ) 5/12 ÷ 6/8 = 5/9

5/12÷6/8

= 5/12×8/6

= (5×8)/(12×6)

= 40/72

= (40÷8/72÷8)

= 5/9

3 ) 2x+5x-3x = 4x

2x+5x-3x

= 7x-3x

= 4x

4 ) y+2y-5y = -2y

y+2y-5y

= 3y-5y

= -2y

5 ) -3x+8x+12 = 5x+12

-3x+8x+12

= (-3+8)x+12

= 5x+12

6 ) 3y+12y-7y+2 = 8y+2

3y+12y-7y+2

= 15y-7y+2

= 8y+2

7 ) 4x²+6x²+3x-15+4x = 10x²+7x-15

4x²+6x²+3x-15+4x

= (4+6)x²+(3+4)x-15

= 10x²+7x-15