已知A=5xy-3xy 4xy
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/14 18:06:24
A+B-3C=08x²y-6xy²-3xy+7xy²-2xy+5x²y-3C=0(13x²y-5xy+xy²)/3=CC-A=(13x&su
A+B=-2C带入,解放成.一定能消.2、同类项,所以N=2,M=3,之后的式子提取公因式:MN(M+N+1)再问:谢谢你、但我比较笨啦、能不能教我一下第一题哇?可以给你分的。
A-2B=5x²-3xy²+2xy-2(7xy²-2xy+x²y)=5x²-3xy²+2xy-14xy²+4xy-2x²
-xy(x^2y^5-xy^3-y)=-(xy^2)^3+(xy^2)^2+xy^2=-(-2)^3+4-2=8+4-2=10
把c用ab表示出来.然后在减a.就是简单的运算.
解(x+1)平方+/y-1/=0∴x+1=0,y-1=0∴x=-1,y=1∴2(xy-5xy平方)-(3xy平方-xy)=(2xy+xy)+(-10xy平方-3xy平方)=3xy-13xy平方=3×(
A=5x²y-3xy²+4xyB=7xy²-2xy+x²y(1)A-2B=(5x²y-3xy²+4xy)-2(7xy²-2xy+x
由A=5x*2y-3xy*2+4xy,B=7xy*2-2xy+x*2y得,A+B=6x*2y+4xy*2+2xy则,所求的式子可转化为-0.5x(6x*2y+4xy*2+2xy)-5x*2y-3xy*
A=8x的二次方乘以y-6xy的二次方-3xyB=7xy的二次方-2xy+5x的二次方乘以yA+B=13x的二次方乘以y+xy的二次方-5xy=3CC=(13x的二次方乘以y+xy的二次方-5xy)/
a-2b=(5x²y-3xy²+4xy)-2(7xy²-2xy+x²y)=5x²y-3xy²+4xy-14xy²+4xy-2x
解C=(-A-B)/2=-2x^2y+xy-2xy^2C-A=-7x^2y-3xy+xy^2
1、x-y=a+32x+y=5a二式相加得3x=6a+3,得x=2a+1代入得y=a-2所以方程组解为x=2a+1,y=a-22、2a+1>a-2,解得a>-3a-2>0,解得a>2综上可得a>23、
A=5x^2y-3xy^2+4xyB=7xy^2-2xy+x^2y2C=-A-B2C-2A=-3A-B=-15x^2y+9xy^2-12xy-7xy^2+2xy-x^2y=-16x^2y+2xy^2-
(1)2A-B=2(3x2+3y2-5xy)-(2xy-3y2+4x2)=6x2+6y2-10xy-2xy+3y2-4x2=2x2+9y2-12xy;(2)当x=3,y=−13时,2A-B=2x2+9
∵A=8x²y-6xy²-3xy,B=7xy²-2xy+5x²y ∴C=3(A+B) =3(8x²y-6xy²-3xy+7xy²
已知A=5x^2y-3xy^2+4xy,B=7xy^2-2xy+x^2y.(1)求A-2B的值A-2B=5x^2y-3xy^2+4xy-2*(7xy^2-2xy+x^2y)=5x^2y-3xy^2+4
3(x^2-xy)-xy+y^2=3(x^2-xy)-(xy-y^2)=3*5-(-3)=15+3=18
①:A=5x²y-3xy²+4xy=xy(5x-3y+4)B=7xy²-2xy+x²y=xy(7y-2+x)A-2B=xy(5x-3y+4)-2[xy(7y-2
原式=-xy²(x²y^4-xy²-1)∵xy²=-2原式=2((-2)²-(-2)-1)=10