5(x+1)=3(y+5),3(y-1)=4(x-4)二分之x-1减三分之y+2=1,三分之二x+二分之y=11-0.5(y-1)= 四分之x+1,三分之x+2=五分之y+3共三道二元一次,标准

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5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3.5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3先化简,再求值; y=5;x=14;y=((x=3*y,x+6),x-1); printf(''x=%d,y=%d'y=5;x=14;y=((x=3*y,x+6),x-1);printf(''x=%d,y=%d'',x,y); 1.5(x+y)+3(x-y)=27(x+y)-3(x-y)=-62.x-y/7 - x+y/10 =1/22(x-y)-5(x+y)=3所谓细节决定成败, 10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组) x²-y²+5x+3y+4(x+y-2xy)(x+y-z)+(xy-1)² 计算:(1)8x^2y^2*(-3x/4y^5) (2)(x+y)^2/xy-y^2*(y-x)^2/xy+y^2 y(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3 已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值. 3(x-1)³y-(1-x)³z m(x-y)²-x+y x²(x+y)(y-x)-xy(x+y)(x-y) 因式分解 (5x-y)(y+5x)-(3y+2x)(3y-2x) x=1 y=2先化简再求值 因式分解:(1)、(2a-3b)(7x+y)+(x-5y)(3b-2a)(2)、(x+y)^3(x+y)^2-(-x-y) 先化简再求值(x-y)(x-2y)-1/2(2x-3y)(x+2y),其中x=2,y=2/5 多项式成多项式(一):(-4X-Y)(-5X+2Y)(二):(Y-1)(Y-2)(Y-3)(三):(2x+3y)(3x-2y)(四):(x+2)(x+3)-(x+6)(x-1)(五):(3x+2y)(2x+3y)-(x-3y)(3x+4y) 先化简,再求值:[(x+2y)²-(x+y)(3x-y)-5y²]÷2x,其中x=-2,y=1/2 先化简,再求值:[(x+2y)²-(x+y)(3x-y)-5y²]÷2x,其中x=-2,y=1/2 (1)x(x+10)-2(3x-2) 分解因式y(2y+1)-y(y-1)+1 2x(2x-y)+y(y-2x) 2y(y-2)-y(y-4)-1 x(x+8)-8(x+2) (a+2)(a-2)-5 (x-3)(a-2)-5 (x+3)(x+4)+4分之1 -(5x+y)-7(x-y) -2分之1(x+y)+4分之1(x+2y) 4x-2(x-2) -2x-(3x-1) x-(5x-2y)+2(2x-y) 先化简,再求值:[(X+2Y)平方-(X+Y)(3X-Y)-5Y平方]除以(2X)其中X=-2,Y=1/2