几道数学题!!急急急急急!!!(一定要写过程)给高高分!!不懂啊~~~
1.(4a³b-10b³)+(-3a²b²+10b³);2.(4x²y-5xy²)-(3x²...
1. (4a³b-10b³)+(-3a²b²+10b³);
2. (4x²y-5xy²)-(3x²y-4xy²);
3. 5a²-(a²+(5a²-2a)-2(a²-3a)) 里面有两个括号,外面的是中括号,里面是小括号。
4. 15+3(1-a)-(1-a-a²)+(1-a+a²-a³);
5. (4a²b-3ab)+(-5a²b+2ab);
6. (6m²-4m-3)+(2m²-4m+1);
7. (5a²+2a-1)-4(3-8a+2a²);
8. 3x²-(5x-(1/2x-3)+2x²); 里面有两个括号,外面的是中括号,里面是小括号。 展开
2. (4x²y-5xy²)-(3x²y-4xy²);
3. 5a²-(a²+(5a²-2a)-2(a²-3a)) 里面有两个括号,外面的是中括号,里面是小括号。
4. 15+3(1-a)-(1-a-a²)+(1-a+a²-a³);
5. (4a²b-3ab)+(-5a²b+2ab);
6. (6m²-4m-3)+(2m²-4m+1);
7. (5a²+2a-1)-4(3-8a+2a²);
8. 3x²-(5x-(1/2x-3)+2x²); 里面有两个括号,外面的是中括号,里面是小括号。 展开
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累死我了~~~~
1. (4a³b-10b³)+(-3a²b²+10b³)
=4a³b-10b³-3a²b²+10b³
= a²b(4a-3b)
2. (4x²y-5xy²)-(3x²y-4xy²)
=4x²y-5xy²-3x²y+4xy²
= x²y- xy²
=xy(x-y)
3. 5a²-[a²+(5a²-2a)-2(a²-3a)]
=5a²-( a²+5a²-2a-2a²+6a)
=5a²-4a2-4a
=a(a-4)
4. 15+3(1-a)-(1-a-a²)+(1-a+a²-a³)
=15+3-3a-1+a+a2+1-a+a2-a3
=18-3a+2a2-a3
5. (4a²b-3ab)+(-5a²b+2ab)
=4a²b-3ab-5a²b+2ab
= -a²b-ab
=-ab(a+1)
6. (6m²-4m-3)+(2m²-4m+1)
=6m²-4m-3+2m²-4m+1
=8m2-8m-2
=2(4m2-4m-1)
7. (5a²+2a-1)-4(3-8a+2a²)
=5a²+2a-1-12+32a-8a2
=-3a2
8. 3x²-(5x-(1/2x-3)+2x²)
=3 x²-5x+(1/2x-3)-2x²
=3 x²-5x+1/2x-3-2x²
= x²-9/2x-3
1. (4a³b-10b³)+(-3a²b²+10b³)
=4a³b-10b³-3a²b²+10b³
= a²b(4a-3b)
2. (4x²y-5xy²)-(3x²y-4xy²)
=4x²y-5xy²-3x²y+4xy²
= x²y- xy²
=xy(x-y)
3. 5a²-[a²+(5a²-2a)-2(a²-3a)]
=5a²-( a²+5a²-2a-2a²+6a)
=5a²-4a2-4a
=a(a-4)
4. 15+3(1-a)-(1-a-a²)+(1-a+a²-a³)
=15+3-3a-1+a+a2+1-a+a2-a3
=18-3a+2a2-a3
5. (4a²b-3ab)+(-5a²b+2ab)
=4a²b-3ab-5a²b+2ab
= -a²b-ab
=-ab(a+1)
6. (6m²-4m-3)+(2m²-4m+1)
=6m²-4m-3+2m²-4m+1
=8m2-8m-2
=2(4m2-4m-1)
7. (5a²+2a-1)-4(3-8a+2a²)
=5a²+2a-1-12+32a-8a2
=-3a2
8. 3x²-(5x-(1/2x-3)+2x²)
=3 x²-5x+(1/2x-3)-2x²
=3 x²-5x+1/2x-3-2x²
= x²-9/2x-3
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