y-16-7.5=x+16 y-16-7.5=3x-y+7.最好讲讲!

y-7x=49x-y=16 解方程组x+y/5+x-y/7=2 3(x+y)+x-y/7=16 方程组 x+5y+2=06x-7y=16x=y= 初二上学期方程题 4x+y=5 5x+4y=63x-2y=1 2x+3y=13x-2y=7 7x+5y=32x+3y=17 2x-y=-4x+5y=6 2x+y=23x-6y=4 3x+2y=52x+y=73x-4y=53x+y=1x-2y=-1x+y=42x+3y=92x-3y=74x+5y=3x+y=20004x+6y=90003x+5y=113x-2y=42x+3y=215x-2y=5x+y=54x+3y=182x+3y=16x+4y=132x+3y=40x y-16-7.5=x+16 y-16-7.5=3x-y+7.最好讲讲! (12-2x)/X=(-16-2Y)/Y X^2+Y^2=25 Y 已知x+y+y=22,x+y=16,求x,y 4x-(2x+y+16)/2=-6y 2x+3y=7-x-2y4x-(2x+y+16)/2=-6y 2x+3y=7-x-2y求方程组的解 16y-2.5y-7.5y=5 y=? 5X+16X= Y+9Y= X+7X-4X= 若x-y=1 化简（x+y)(x^2+y^2)(x^4+y^4)(x^8+y^8)(x^16+y^16) x+y=5① x=3y+2① 9x-5y=1① 3x-2y=11① x-2y=y+1① 2x-y=7② x+3y=8② 6x-7y=2② 2x+3y=16② 2x-3y=10②3x+2y=y+1①2x-3y=10②D (x+y)^2-16(x-y)^2 16-8(x-y)+(x-y)平方 (x+y)²-16(x-y)² (x+y)^2-16(x-y)^2 16-8（x-y)+(x-y)2 shuxue数学.1.5x+12y=360 7x+16y=500求x 2.x+y=36y-x=28求x