(3x-4y+1)(3x+4y+1)
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(3x-4y+1)(3x+4y+1)
(3x-4y+1)(3x+4y+1)
(3x-4y+1)(3x+4y+1)
=(3x+1-4y)(3x+1+4y)
=(3x+1)平方-16y平方
多项式乘法
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
已知x+y=-2,试计算1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y的值
(x+y)(x+y)-4(x+y-1)
x(x+y)-y(3x-4y)因式分解.快.
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
把(x+y),(x-y)个作为一个整体合并同类项1,7(x+y)-2(x+y)-4(x+y)+2(x+y)2,(x-y)²+2(x-y)-(x-y)-2(x-y)²
把(x-y),(a+b)作为一个因式,合并同类项:3(x-y)-9(x-y)-8(x-y)+6(x-y)-1
(3x-4y+1)(3x+4y+1)
(2x-y)乘(2x+y)+(2x-y)乘(y-4x)+2y(y-3x)
先化简,再求值. [(x+1/4y)-(x-1/4y)]·(3x-1/3y)(1/3y+3x)先化简,再求值.[(x+1/4y)-(x-1/4y)]·(3x-1/3y)(1/3y+3x)(1/9y+9x),其中x=1,y=-3.这题怎么做,求解,一定好评!
(x/x+y +2y/x+y)乘以xy/ x+2y除以(1/x+1/y)(2)(3x^2/4y)^2乘以2y/3x+ x^2/2y^2除以2y^2/x
先化简再求值 [(x-y)²+(x+y)(x-y)]÷2x,其中x=3,y=1
用代入法解下列方程组:(1){y=x-3,y-2x=5; (2){x-3y=7,3x+用代入法解下列方程组:(1){y=x-3,y-2x=5; (2){x-3y=7,3x+y=1; (3){2x-y=5,x+y=1; (4){x-
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);
计算:(1)y/4x²y-1/12y²;(2)2/x+y-x+3/x+y(3)a²/a+3-9/a+3
1.(-2a)³·b²÷(8a³b²) 2.-5x(2x²-3x+4)+4x³+15x3.(x²-2y²)(x+2y)-2xy(x-y)4.(x-y+z)(x-y-z)化简求值 [(x+y)(x-y)-(x+y)²-2y(x-2y)]÷(-2y),其中x=5,y=2003
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()
3(X-Y)-5(X-Y)平方-3(X+Y)+(Y-X)平方-4(X+Y)平方+3(Y-X)化简....加油:)