练习一 BAABA B =-0.5 =0.5 a-b -2 a^3-a^2b 19:13 60x^2 y^2 Y=x -
练习一 BAABA B =-0.5 =0.5 a-b -2 a^3-a^2b 19:13 60x^2 y^2 Y=x -
已知:A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B
1.已知集合A={(x,y)|y=2x+1},B={(x,y)|y=x+3},a∈A,b∈B,求a
x+y-(2x-y)(x+y)=?12(a^2-b^2)^2-3(a^2+b^2)(a+b)^2等于多少(2a-b)(2
define A(x,y) x*y-x/y main(){int a=5,b=2,y;y=A(a+b,a-b);prin
设集合A={y/y=x^2十l},B={y/y=一X^2十2X十3},求A交B
A=2x十y,B=2x一y,计算A的平方一B的平方
(x+y)(a-2b)
单项式A,B满足等式2x(A-3x)=4x的平方y+B,求A,B
先化简,再求值:(3x-y)^2-5x(x-y),其中x=0.2,y=0.1 , (2a+b)(2a-b)-3(2a-b
3a(x+y)-2b(x+y)=(x+y)(?)
对于有理数a,b,定义:a*b=3a-2b,若x,y均为有理数,试计算【(x+y)*(x-y)】*2 x.