求几道数学题.急
1.(a²+4)²-16²2.a(x-y)-b(y-x)+c(x-y)3.y²-9(x+y)²4.(a+b/2)&sup...
1. (a²+4)²-16²
2. a(x-y)-b(y-x)+c(x-y)
3. y²-9(x+y)²
4.(a+b/2)²-(a-b/a)²
5. 2x²+2x+1/2
6.(x+1)(x+2)+1/4
要过程 全部要过程!急 各位大姐大哥们帮帮
我要今天晚上就出答案.快!答案快就提分10分 展开
2. a(x-y)-b(y-x)+c(x-y)
3. y²-9(x+y)²
4.(a+b/2)²-(a-b/a)²
5. 2x²+2x+1/2
6.(x+1)(x+2)+1/4
要过程 全部要过程!急 各位大姐大哥们帮帮
我要今天晚上就出答案.快!答案快就提分10分 展开
2个回答
展开全部
(1) (a²+4)²-16² =(a²+4-16)(a²+4+16)=(a²-12)(a²+20) 但是我觉得你可能抄错题了....应该是(a²+4)²-16吧.....
(a²+4)²-16=(a²+4-4)(a²+4+4)=a²(a²+8)=a^4+8a^
(2) a(x-y)-b(y-x)+c(x-y)=a(x-y)+b(x-y)+c(x-y)=(a+b+c)(x-y)
(3) y²-9(x+y)²=[y-3(x+y)][y+3(x+y)]=(-2y-3x)(3x+4y)=-9x^2-18xy-8y^2
(4)(a+b/2)²-(a-b/a)²=[a+b/2-(a-b/2)][a+b/2+(a-b/2)]=b*2a=2ab
(5)2x²+2x+1/2=2(x²+x)+1/2=2(x+1/2)²-2*(1/2)²+1/2=2(x+1/2)²
(6)(x+1)(x+2)+1/4 =x²+(1+2)x+2+1/4=x²+3x+9/4=(x+3/2)²
你也没说是合并同类项还是得出答案....
(a²+4)²-16=(a²+4-4)(a²+4+4)=a²(a²+8)=a^4+8a^
(2) a(x-y)-b(y-x)+c(x-y)=a(x-y)+b(x-y)+c(x-y)=(a+b+c)(x-y)
(3) y²-9(x+y)²=[y-3(x+y)][y+3(x+y)]=(-2y-3x)(3x+4y)=-9x^2-18xy-8y^2
(4)(a+b/2)²-(a-b/a)²=[a+b/2-(a-b/2)][a+b/2+(a-b/2)]=b*2a=2ab
(5)2x²+2x+1/2=2(x²+x)+1/2=2(x+1/2)²-2*(1/2)²+1/2=2(x+1/2)²
(6)(x+1)(x+2)+1/4 =x²+(1+2)x+2+1/4=x²+3x+9/4=(x+3/2)²
你也没说是合并同类项还是得出答案....
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