初中整式加减

(1)2（4x-0.5)

(2)3x-x-5x

(3)-x+(2x-2)-(3x+5)

(4)3a的2次方+a的2次方-（2a的2次方-2a）+（3a-a的2次方）

(5)x-(3x-2)+(2x-3)

(6)（3a的2次方+a-5）-（4-a+7a的2次方）

(7)(2m-3)+m-(3m-2)

(8)3(4x-2y)-3(-y+8x)

8道都要有过程，我坚决不选只有答案的，我要他的过程

解：

（1）原式=2×4x-2x0,5

=8x-1

(2)原式=(3-1-5)x

=-3x

(3)原式=-x+2x-2-3x-5

=(-1+2-3)x-7

=-2x-7

(4)原式=(3+1-2-1)a^2+(2+3)a

=a^2+5a

(5)原式=(1-3+2)x+2-3

=-1

(6)原式=(3-7)a^2+(1+1)a-5-4

=-4a^2+2a-9

(7)原式=(2+1-3)m-3+2

=-1

(8)原式=12x-6y+3y-24x

=(12-24)x+(-6+3)y

=-12x-3y

2(4x-0.5)

解:原式=2×4x-2×0.5

=8x-1

3x-x-5x

解:原式= -3x

-x+(2x-2)-(3x+5)

解:原式= -x+2x-2-3x-5

= -x+2x-3x-2-5

= -2x-7

3a²+a²-(2a²-2a)+(3a-a²)

解:原式= 3a²+a²-2a²+2a+3a-a²

=a²+5a

x-(3x-2)+(2x-3)

解:原式=x-3x+2+2x-3

=4x-1

(3a²+a-5)-(4-a+7a²)

解:原式=3a²+a-5-4+a-7a²

=-4a²+2a-9

(2m-3)+m-(3m-2)

解:原式=2m-3+m-3m+2

=2m+m-3m-3+2

= -1

3(4x-2y)-3(-y+8x)

解:原式=12x-6y-(-3y+24x)

=12x-6y+3y-24x

=12x-24x-6y+3y

= -12x-3y

请采纳.谢谢!

(1) 2(4x-0.5) (2) 3x-x-5x =2×4x-2×0.5 =-3x =8x-1

(3) -x+(2x-2)-(3x+5) (4) 3a^2+a^2-（2a^2-2a）+（3a-a^2） =-x+2x-2-3x-5 =4a^2-2a^2+2a+9a^2-a^2 =-2x-7 =10a^2+2a

(5) x-(3x-2)+(2x-3) (6) （3a^2+a-5）-（4-a+7a^2）

=x-3x+2+2x-3 =3a^2+a-5-4+a-7a^2

=-2x-1 =2a^2+2a-9

(7)(2m-3)+m-(3m-2) (8) 3(4x-2y)-3(-y+8x)

=2m-2+m-3m+2 =12x-6y+3y-24x

=-1 =-12x-3y