下列各等式中正确A.-2x·x^2=2x^3 B.4x^2y-5xy^2=-x^2y C.3x^2·(2x)^3=6x^
下列各等式中正确A.-2x·x^2=2x^3 B.4x^2y-5xy^2=-x^2y C.3x^2·(2x)^3=6x^
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y.若x
下列各式添括号正确的是:( ) A.-x+y=-(y-x) B.x-y=-(x+y) C.10-m=5(2-m) D.3
已知A=3x²-xy+y²,B=2x²-3xy-2y²,其中x、y满足等式2(x
已知A=x^3+3x^2y-5xy^2+6y^3-1,B=y^3+2xy^2+x^2y-2x^3+2,C=x^3-4x^
下列运算正确的是A.3x ^3-2x^2=x B.x^6÷x^3=x^2 C.x^2·x^2=x^4 D.(2x^3)^
下列计算正确的是 A.X+X=X^2 B.4X^3-2X=2X^2 C.3X^2+2X^2=5x^2 D.3X^2=X^
下列计算正确的是 A(3X-2X=1) B (3X+2X=5X² C(3X×2X=6X) D(3X-2X=X)
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
已知6x^2-7xy-3y^2+14x+y+a=(2x-3y+b)(3x+y+c),则……