2)/(3x-1)4y=28,则y=7BE=BC CE=BC CA/2;CF=CA AF=CA AB/2ax*2 bx c=0中 -ac
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2)/(3x-1)4y=28,则y=7BE=BC CE=BC CA/2;CF=CA AF=CA AB/2ax*2 bx c=0中 -ac
2)/(3x-1)4y=28,则y=7
BE=BC CE=BC CA/2;CF=CA AF=CA AB/2ax*2 bx c=0中 -ac
2)/(3x-1)4y=28,则y=7BE=BC CE=BC CA/2;CF=CA AF=CA AB/2ax*2 bx c=0中 -ac
2y-x=4√a⒉-√b⒉=√〔a-b〕对比∴(√a √b) 2;≥0 ∴a b-2√ab≥0 对比2y-x=4
集合A={y|y=x²-4x+3},B={y|y=-x²-2x},那么A∩B=1、集合A={y|y=x²-4x+3},B={y|y=-x²-2x},那么A∩B=2、集合A={y|y=x²-4x+7},B={y|y=-x²-4x+3},那么A∩B=
集合A={y|y=x²-4x+3},B={y|y=-x²-2x},那么A∩B=1、集合A={y|y=x²-4x+3},B={y|y=-x²-2x},那么A∩B=2、集合A={y|y=x²-4x+7},B={y|y=-x²-4x+3},那么A∩B=
1、(-y^3)^5/y^3/ y^2+2(-y)^102、(x-y)^7/(y-x)^6+(x+y)^3/(x+y)^23、已知X^a=5,x^b=3,求X^(3a-2b)的值
3y+7/(y-1)(y-2)=A/(y-1)+B/(y-2),则A=( )B=( )若x+1/x=3,则x²/x^4+x²+1=( )
已知6x^2-7xy-3y^2+14x+y+a=(2x-3y+b)(3x+y+1),则a=?,b=?
若集合A={(x,y)|4x+y=6},B={(x,y)|3x+2y=7},则集合A∩B=
1.设A={(x,y)/4x+y=6} B={(x,y)/3x+2y=7} 则A∩B等于多少
设A={(x,y)|3X+2y=4},B={(x,y)|2x+3y=1},则A交B等于多少
因式分解:(1)x²y-2xy²+y³ (2)(x+2y)²-y²因式分解:(1)x²y-2xy²+y³ (2)(x+2y)²-y²解方程组:﹛x=y+7(1) 3x-y=5(2)﹛2x+y=3(1) 4x-3y=5(2)已知x的a次方=3,x的b次方=5,则x
1(x-3x-1)(x+3y-1)2(3x-2y+1/4)²3(a+b)²-(a-b)²4 [2x²-(x+y)(x-y)][(-x-y)×(y-x)+2y²],其中x=1 y=25[(0.5x-y)²+(0.5x+y)²](0.5x²-2y²)6(a+3b)²-2(a+3b)(a-3b)+(a-3b)²7
1、(x+y)-(x+y)^32、x(x-y)-y(y-x)3、(a-b)^2-4b+4a4、a^n+1+a^n+a^n-15、x(x+y)(x-y)-x(x+y)^26、已知a+c-7=0,求(a+b)^2-2a(b-c)-2b(b-c)+(c-b)^2的值7、x^2-8y^2(x^2-2y^2)
若|3x+2y-4|与6(5x+7y-3)的平方互为相反数,则x y的值是 A X=1 Y=1 B x=2 y=-1 C不存在
(1)(x+y)^2-(x+y)^3(2)(x-y)-(x-y)^3(3)(x-y)^2-(y-x)^3(4)2(x-y)-3(y-x)^2(5)4ab(a=b)^2-6a^2b(a+b)(6)(x+y)^2(x-y)+(x+y)(x-y)^2(7)2a(a-3)^2-6a^2(3-a)+8a(a-3)(8)24xy^2z^2(x+y-z)-32xyz(z-x-y)^2+8xy(z-x-y)(9)(a-b)(b-a)^n(b-a)^2n-1 [两解)(10)2^2=3,2^b
几道 数学题急啊 对了再加20分(x+y)^2-(x+y)^3(x-y)^2-(x-y)^3 (x-y)^2-(y-x)^32(x-y)-3(y-x)^24ab(a+b)^2-6a^2b(a+b)(x+y)(x-y)-(x+y)^28a(x-y)^2-4b(y-x)a=-5 a+b+c=-5.2求代数式a^2(-b-c)-3.2a(c+b)的值
设x,y满足约束条件x+y>=1,x-y>=-1,2x-y=7*(a^3b^4)^(1/7)
已知3x-4y+7=0,则x*x-2x+y*y的最小值为A.1 B.2 C.3 D.4
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
集合A={(x,y)|x-2y=1}B={(x,y)|x+3y=6},则A∩B= A∪B=?