{x/3-y=5 (1) {x/4-y=1 (2) {5x+2y=5 (1) {2x+5y=8 (2)解下列方程组{x/3-y=5 (1){x/4-y=1 (2){5x+2y=5 (1){2x+5y=8 (2)
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/23 10:27:16
{x/3-y=5(1){x/4-y=1(2){5x+2y=5(1){2x+5y=8(2)解下列方程组{x/3-y=5(1){x/4-y=1(2){5x+2y=5(1){2x+5y=8(2){x/3-y
{x/3-y=5 (1) {x/4-y=1 (2) {5x+2y=5 (1) {2x+5y=8 (2)解下列方程组{x/3-y=5 (1){x/4-y=1 (2){5x+2y=5 (1){2x+5y=8 (2)
{x/3-y=5 (1) {x/4-y=1 (2) {5x+2y=5 (1) {2x+5y=8 (2)
解下列方程组
{x/3-y=5 (1)
{x/4-y=1 (2)
{5x+2y=5 (1)
{2x+5y=8 (2)
{x/3-y=5 (1) {x/4-y=1 (2) {5x+2y=5 (1) {2x+5y=8 (2)解下列方程组{x/3-y=5 (1){x/4-y=1 (2){5x+2y=5 (1){2x+5y=8 (2)
第一题x=48,y=11(两式相减,消去y解得x)
第二题x=3/7,y=10/7 ((1式乘以5)减去(2式乘以2)消去y解得x)
50
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
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(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3
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()
{5(x-3y)-6=2x+1 3(x+6y)+4=9y+19 {3分之2(x-y)=4分之x+y-1 6)x+y)=4(2x-y)+16
[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x,y满足x²+4x+y²-y+17/4=0已知、x+y=6且xy=4(1)x²+y² (2)(x-y)² (3)x{四次方}+y{四次方}第一题没错 书上就这样写的!
{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
{x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0
数学计算填空(5x+y)(5x-y)(5x+y)(-5x+y)(5x+y)(-5x-y)(5x+y)(x-5y)(x ^m+y ^n) (y ^n- x^ m)(x ^m+2y-3x^3)²(x-2y)(______)=4y²-x²(__________)²=m²-2m+1(只需要写一个代数式)(__________+3)²=4x²+(_______)
(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5