麻烦帮一下忙
去括号,并合并同类项3b^2-(a^2+a^2)-b^2x+(2x-1)-(x/3-2(2b-3a^2)2a^2-1/2(ab+a^2)-8ab-(b-4)+4(-b-3...
去括号,并合并同类项 3b^2-(a^2+a^2)-b^2
x+(2x-1)-(x/3
-2(2b-3a^2)
2a^2-1/2(ab+a^2) -8ab
-(b-4)+4(-b-3)
1/22(x^2-y^2)+1/6(x^2+y^2) 展开
x+(2x-1)-(x/3
-2(2b-3a^2)
2a^2-1/2(ab+a^2) -8ab
-(b-4)+4(-b-3)
1/22(x^2-y^2)+1/6(x^2+y^2) 展开
展开全部
3b^2-(a^2+a^2)-b^2=2b^2-2a^2=2(b^2-a^2)=2(b-a)(b+a)
x+(2x-1)-(x/3)=[x+2x-(x/3)]-1=(8x)/3-1
-2(2b-3a^2)=6a^2-4b
2a^2-1/2(ab+a^2) -8ab=2a^2-(ab)/2-(a^2)/2-8ab=[2a^2-(a^2)/2]-[(ab)/2+8ab]=(3a^2)/2-(17ab)/2
-(b-4)+4(-b-3)=-b+4-4b-12=-(b+4b)+(4-12)=-5b-8
1/22(x^2-y^2)+1/6(x^2+y^2)=[(x^2)/22+(x^2)/6]+[(y^2)/6-(y^2)/22]=(7x^2)/33+(4y^2)/33
还有什么疑问就补充提问啦。。
x+(2x-1)-(x/3)=[x+2x-(x/3)]-1=(8x)/3-1
-2(2b-3a^2)=6a^2-4b
2a^2-1/2(ab+a^2) -8ab=2a^2-(ab)/2-(a^2)/2-8ab=[2a^2-(a^2)/2]-[(ab)/2+8ab]=(3a^2)/2-(17ab)/2
-(b-4)+4(-b-3)=-b+4-4b-12=-(b+4b)+(4-12)=-5b-8
1/22(x^2-y^2)+1/6(x^2+y^2)=[(x^2)/22+(x^2)/6]+[(y^2)/6-(y^2)/22]=(7x^2)/33+(4y^2)/33
还有什么疑问就补充提问啦。。
参考资料: baidu .
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