7x+10y=400,5x+16y=330这组方程组的解是

方程组 共四题 3x-4y=10 x+2y+2=0 5x+6y=42 7x-4y=-41 3x+4y=16 3x+5y=5 5x-6y=33 3x-4y=23（1）3x-4y=10 （2） x+2y+2=05x+6y=42 7x-4y=-41（3)3x+4y=16 3x+5y=55x-6y=33 (4) 3x-4y=23 x+y=16 5x-6y=33 (x+y)/6+(x-y)/10=1,(x+y)/6-(x-y)/10=5 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 (7x-10y)-(-10y-5x)=? x-y/7 - x+y/10 =1/2 2(x-y)-5(x+y)=3修改、、、、（x-y)/7-(x+y)/10=1/2 2(x-y)-5(x+y)=3 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 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, 5X+16X= Y+9Y= X+7X-4X= 解方程组x+y/5+x-y/7=2 3(x+y)+x-y/7=16 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 { x-y/7-x+y/10=1/2 {2(x-y)+5(x+y)=3 { x-y/7-x+y/10=1/2 {2(x-y)+5(x+y)=3 方程组 x+5y+2=06x-7y=16x=y= X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y) 若5x+y/7x+10y=1/2,则x/y=? 若7x+10y分之5x+y=1/2,则x/y=