x/3-y/4=3x+2y-75=3答案

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x/3-y/4=3x+2y-75=3答案
x/3-y/4=3x+2y-75=3答案

x/3-y/4=3x+2y-75=3答案
1)4=[x/(3-y)]/4,12=x/(3-y),12(3x-y)=x,36x-12y=x,35x=12y 2)4=3x+2y-75,79=3x+2y,2y=79-3x,12y=684-18x,由1）得684-18x=

x=18
y=12

1)4=[x/(3-y)]/4,12=x/(3-y),12(3x-y)=x,36x-12y=x,35x=12y 2)4=3x 2y-75,79=3x 2y,2y=79-3x,12y=684-18x,由1）得684-18x=

x=18
y=12

由题设
x/3-y/4=3
3x+2y-75=3
4x-3y=36
3x+2y=78
联立解得x18，y=12

由题设
x/3-y/4=3
3x+2y-75=3
4x-3y=36
3x+2y=78
解
x=18，y=12

(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= x/3-y/4=3x+2y-75=3答案 { (x+y)/5+(x-y)/2=3 (x+y)/5-(x-y)/2=1的答案是多少, 2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 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/3+x-y/2=6 4(x+y)-2(x-y)=40 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 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=? (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一