Question

初一数学题。整式加减法5道。很简单。帮个忙

①-b+0.6b-2.6b
②2(4x-0.5)
③-x+(2x-2)-(3x+5)
④（5a+4c+7b)+(5c-3b-6a)
⑤（2x²-½+3x）-4(x-x²+½)

Answer 1

①-b+0.6b-2.6b
=-b-2b
=-3b
②2(4x-0.5)
=8x-1
③-x+(2x-2)-(3x+5)
=-x+2x-2-3x-5
=-2x-7
④（5a+4c+7b)+(5c-3b-6a)
=5a+4c+7b+5c-3b-6a
=9c+4b-a
⑤（2x²-½+3x）-4(x-x²+½)
=2x²-½+3x-4x+4x²-2
=6x²-x-5/2

Answer 2

-3b
8x-1
-2x-7
-a+4b+9c
-2x²-x-3/2

Answer 3

-3b
8x-1
-2x-7
-a+4b+9c
6x²-x-1

Answer 4

-3b
8x-1
-2x-7
-a+4b+9c
6x2-x-2½