Question

帮帮我吧，会数学化简的请进

化简 1、12a-4a+7b-b 2、 7×(2a-2)-9a-b 3、6n+(10+2n)+16 4、4×9x÷2 5,15t-10-3×4t+2 6,2×（x-5y）+4×（2x-6y） 7,8a+2b+6×(a-b) 8,9y+2x+3y-x 9,7x-（5y-4y）-2x 10，13+9m-10+16m 11，2×(3x+4+5x)-8
(只要对，我给50分但要等明天老师批的情况，要一步步写清楚，所有的至少要两步 ，一定要化简）

Answer 1

1、12a-4a+7b-b
=(12-4)a+(7-1)b
=8a+6b
2、 7×(2a-2)-9a-b
=14a-14-9a-b
=5a-b-14
3、6n+(10+2n)+16
=6n+10+2n+16
=6n+2n+10+16
=8n+26
4、4×9x÷2
=36x÷2
=18x
5,15t-10-3×4t+2
=15t-10-12t+2
=15t-12t-10+2
=3t-8
6,2×（x-5y）+4×（2x-6y）
=2x-10y+8x-24y
=2x+8x-10y-24y
=10x-32y
7,8a+2b+6×(a-b)
=8a+2b+6a-6b
=8a+6a+2b-6b
=14a-4b
8,9y+2x+3y-x
=9y+3y+2x-x
=12y+x
9,7x-（5y-4y）-2x
=7x-5y+4y-2x
=7x-2x -5y+4y
=5x-y
10，13+9m-10+16m
=13-10+9m+16m
=3+25m
11，2×(3x+4+5x)-8
=2×(8x+4)-8
=16x+8-8
=16x

Answer 2

12a-4a+7b-b
=(12-4)a+(7-1)b
=8a+6b

Answer 3

1 12a-4a+7b-b
=a(12-4)+b(7-1)
=8a+6b
2 7×(2a-2)-9a-b
=14a-14-9a-b
=5a-b-14
3 6n+(10+2n)+16
=6n+10+2n+16
=8n+26
4 4×9x÷2
=36x÷2
=18x
5 15t-10-3×4t+2
=15t-10-12t+2
=3t-8
6 2×（x-5y）+4×（2x-6y）
=2x-10y+8x-24y
=10x-34y

7 8a+2b+6×(a-b)
=8a+2b+6a-6b
=14a-4b

8 9y+2x+3y-x
=y(9+3)+x(2-1)
=12y+x

9 7x-（5y-4y）-2x
=7x-y-2x
=5x-y
10 13+9m-10+16m
=13-10+9m+16m
=3+25m
11 2×(3x+4+5x)-8
=6x+8+10x-8
=16x