去括号并合并同类项:8x-(-3x-5) (3x-1)-(2-5x) (-4y+3)-(

问题描述:

去括号并合并同类项:8x-(-3x-5) (3x-1)-(2-5x) (-4y+3)-(
去括号并合并同类项:8x-(-3x-5) (3x-1)-(2-5x) (-4y+3)-(-5y-2) 3x+1-2(4-x) (2x-3y)+(5x+4y) (8a-7b)-(4a-5b)

8x-(-3x-5)
=8x+3x+5
=11x+5
(3x-1)-(2-5x)
=3x-1-2+5x
=8x-3
(-4y+3)-(-5y-2)
=-4y+3+5y+2
=y+5
3x+1-2(4-x)
=3x+1-8+2x
=5x-7 (2x-3y)+(5x+4y)
=2x-3y+5x+4y
=7x+y
(8a-7b)-(4a-5b)
=8a-7b-4a+5b
=4a-2b