(a-2)x平方 (a 2b)xy 7不含二次项,求3a-5b的值.
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解2(x²-xy)-3(2x²-3xy)=(2x²-6x²)+(-2xy+9xy)=-4x²+7xy再问:����|-15|-8�£�-2��+4*�
2A-3B=2(4x²-4xy+y²)-3(x²+xy-5y²)=8x²-8xy+2y²-3x²-3xy+15y²=5x
2A-3B=2(4x²-4xy+y²)-3(x²+xy-5y²)=(8x²-8xy+2y²)-(3x²+3xy-15y²
A=3x^2y-4xy^2B=-x^2y-2xy^2A+B=3x^2y-4xy^2-x^2y-2xy^2=2x^2y-6xy^2A+B+C=0C=-(A+B)=-(2x^2y-6xy^2)=6xy^2
B-A=(2x²+xy-3y²)-(x²-3xy+2y²)=x²+4xy-5y²=(x-y)(x+5y)
1.2a-3(3a-2b)2(a+2b)=2a-(9a-6b)(2a+4b)=2a-(18a^2-12ab+36ab-24b^2)=2a-18a^2+12ab-36ab+24b^2=2a-18a^2-
A=5x²y-3xy²+4xyB=7xy²-2xy+x²y(1)A-2B=(5x²y-3xy²+4xy)-2(7xy²-2xy+x
∵A=4x²-4xy+y²B=x²+xy-5y²∴(3A-2B)-(2A+B)=3A-2B-2A-B=A-3B=4x²-4xy+y²-3(x
117a平方b立方分之27a立方b平方=13b分之3ax平方+2xy+y平方分之x平方+xy=(x+y)分之x不懂可追问,有帮助请采纳,谢谢!
a=x平方-2xy+y平方,b=x平方+2xy+y平方所以x²+y²=a+2xy=b-2xy所以4xy=b-a
2x²-3xy+(2xy-x²)=2x²-3xy+2xy-x²=x²-xy=x(x-y)
x的平方-2xy/xy-2y的平方=x(x-2y)/y(x-2y)=x/y
解题思路:题不完整,请补充解题过程:.最终答案:略
a-2b=(5x²y-3xy²+4xy)-2(7xy²-2xy+x²y)=5x²y-3xy²+4xy-14xy²+4xy-2x
A=y的平方+xy—x的平方,B=y的平方-xy+2x的平方,所以A-B=y的平方+xy—x的平方-y的平方+xy-2x的平方=2xy-3x的平方,3A+2B=3y的平方+3xy—3x的平方+2y的平
4x的平方+8xy+9y的平方=4x的平方+2xy+9y的平方+6xy=2a+3
a(x²+2xy+y²)-b(x²-y²)=a(x+y)²-b(x+y)(x-y)=(x+y)(ax+ay-bx+by)再问:你确定对吗?和我已开始算
1.a=4b=7c=-12.系数是:-7分之派,次数是:43.2006X的三次方Y4.a平方-5a+65.(b+c)-(a-d)=b+c-a+d=(b-a)+(c+d)=-(a-b)+(c+d)=3+
A-B=2x^2-3xy+2y^2-(2x^2+xy-3y^2)=2x^2-3xy+2y^2-2x^2-xy+3y^2=2x^2-2x^2-3xy-xy+2y^2+3y^2=-4xy+5y^2