Question

合并同类项去括号的，急用 50分奖励

{4a³b-10b³}+{-3a²b²+10b³}

{4x²y-5xy²}-{3x²y-4xy²}

5a²-【a²+{5a²-2a}-2{a²-3a}】
快点，85分了 ,再追加5道题，给100百分，快点
15+3{1-a}-{1-a-a²}+{1-a+a²-a³}

{4a²b-3ab}+{-5a²b+2b}

{6m²-4m-3}+{2m²-4m+1}

{5a²+2a-1}-4{3-8a+2a²}

3x²-【5x-{1/2-3}+2x²】

Answer 1

｛4a³b-10b³｝+｛-3a²b²+10b³｝
=4a³b-10b³-3a²b²+10b³
=4a³b-3a²b²
｛4x²y-5xy²｝-｛3x²y-4xy²｝
=4x²y-5xy²-3x²y+4xy²
=x²y-xy²
5a²-[a²+｛5a²-2a｝-2｛a²-3a｝]
=5a²-[a²+5a²-2a-2a²+6a]
=5a²-a²-5a²+2a+2a²-6a
=a²-4a
补充：
15+3｛1-a｝-｛1-a-a²｝+｛1-a+a²-a³｝
=15+3-3a-1+a+a²+1-a+a²-a³
=19-3a+2a²-a³
｛4a²b-3ab｝+｛-5a²b+2b｝
=4a²b-3ab-5a²b+2b
=-a²b-3ab+2b
｛6m²-4m-3｝+｛2m²-4m+1｝
=6m²-4m-3+2m²-4m+1
=8m²-8m-2
｛5a²+2a-1｝-4｛3-8a+2a²｝
=5a²+2a-1-12+32a-8a²
=-3a²+34a-13
3x²-[5x-｛1/2-3｝+2x²]
=3x²-[5x+5/2+2x²]
=3x²-5x-5/2-2x²
=x²-5x-5/2

Answer 2

{4a³b-10b³}+{-3a²b²+10b³}
=4a³b-10b³-3a²b²+10b³
=4a³b-3a²b²

{4x²y-5xy²}-{3x²y-4xy²}
=4x²y-5xy²-3x²y+4xy²
=x²y-xy²

5a²-【a²+{5a²-2a}-2{a²-3a}】
=5a²-a²-{5a²-2a}+2{a²-3a}
=4a²-5a²+2a+2a²-6a
=a²-4a

Answer 3

你好！

(1) (4a³b-10b³)+(-3a³b²+10b³) =4a³b-3a²b²=a²b(4a-3b)=4a³b-3a²b²

(2) (4x²y-5xy²)-(3x²y-4xy²)=4x²y-5xy²-3x²y+4xy²=x²y-xy²=xy(x-y)= x²y+xy²

(3)5a²-[a²+(5a²-2a)-2(a²-3a)]=5a²-(a²+5a²-2a-2a²+6a)=5a²-(4a²+4a)=a²-4a=a(a-4)=a²-a

Answer 4

1. 4a³b-3a²b²
2. x²y+xy²
3. a²-a

Answer 5

(1)4a^3-3a^2b^2 (2)x^2-xy^2 (3)a^2-4a