几道计算题,(初一的知识解,去括号的)计算((1)8x-(5x-4)(2)(3x-2y)-(-x-y)(3)2(x-3)-3(2x-5)(4)5(-m+n)-7(m-n)(5)-3(a+b+c)-4(-a-5b+6c)

问题描述:

几道计算题,(初一的知识解,去括号的)
计算((1)8x-(5x-4)
(2)(3x-2y)-(-x-y)
(3)2(x-3)-3(2x-5)
(4)5(-m+n)-7(m-n)
(5)-3(a+b+c)-4(-a-5b+6c)

1.3x+4
2.4x-y
3.-4x+9
4.-12m+12n
5.a+17b-27C
望采纳

(1)8x-(5x-4)
=8x-5x+4
=3x+4
(2)(3x-2y)-(-x-y)
=3x-2y+x+y
=4x-y
(3)2(x-3)-3(2x-5)
=2x-6-6x+15
=9-4x
(4)5(-m+n)-7(m-n)
=5n-5m-7m+7n
=12n-12m
(5)-3(a+b+c)-4(-a-5b+6c)
=-3a-3b-3c+4a+20b-24c
=a+17b-27c
祝你学习进步!!!

  1. =8X-5X+4=3X+4

  2. =3X-2Y+X+Y=4X-Y

  3. =2X-6-6X+15=9-4x

  4. =-5m+5n-7m+7n=-12m+12n

  5. =-3a-3b-3c+4a+20b-24c=a+17b-27c

(1)8x-(5x-4)
=8x-5x+4
=3x+4
(2)(3x-2y)-(-x-y)
=3x-2y+x+y
=4x-y
(3)2(x-3)-3(2x-5)
=2x-6-6x+15
=-4x+9
(4)5(-m+n)-7(m-n)
=-5m+5n-7m+7n
=12n-12m
(5)-3(a+b+c)-4(-a-5b+6c)
=-3a-3b-3c+4a+20b-24c
=a+17b-27c
不懂可以追问哦,望采纳,祝学习进步O(∩_∩)O

(1)8x-(5x-4)=8x-5x+4=3x+4(2)(3x-2y)-(-x-y)=3x-2y+x+y=4x-y(3)2(x-3)-3(2x-5)=2x-6-6x+15=-4x+9(4)5(-m+n)-7(m-n)=-5m+5n-7m+7n=12n-12m(5)-3(a+b+c)-4(-a-5b+6c) =-3a-3...