超多數學功課問題？？？？？？？(15分)

1. y+2y+3
=3y+3
=3(y+1)
2. x+4+5x
=6x+4
=2(3x+2)
3. 3y+4+2y+6
=5y+10
=5(y+2)
4. 5x+23-3x-7
=2x+16
=2(x+8)
5. 6w+5-7-2w
=4w-2
=2(2w-1)
6. -2x+8x-7-6
=6x-13
7. -5y+8-3y-2
= -8y +6
= -2(4y-3)
8. 4x+8-7x-17
= -3x-9
= -3(x+3)
9. 6y+5y-3-7y
=4y-3
10. 4x+6y-8-2x
=10y-2x-8
=2(5y-x-4)
11. 12y+4x-7-6y
=6y+4x-7
12. 3x+8y-7x+2
=8y-4x+2
=2(1+4y -2x)

1. y+2y+3 = 3y+3 (very easy)
Others are very easy too. Why not try yourself.