7x-3y=-12 4x+2y=-5
2个回答
7x-3y=-12 4x+2y=-5
14x-6y=-24 12x+6y=-15 相加得:26x=-39 x=-13/8
y=3/4
相关问题
3(X-1)+5(4Y+2)=7 4(X+5)-3(Y+1)=12
2x+5y+4z=6,3x+y-7z=-4,4x+3y+12z=-2 求x+y+z
计算 3(2x-7y)(7y+2x)+(4x+5y)(-5y-4x)
y=2x-7 3y+2z=2 3x-4z=4和4x+9y=12 3y-2z=1 7x+5z=19/4
(1)y=2x-7 6x+3y+2z=2 3x-4z=4 (2) 4x+9y=12 3y-2z=1 7x+5z=19/4
(1)7x-6=4x+6;(2)y+12=12y+2;(3)2(3x-1)-3(x+5)=1;(4)[x−1/4−2x+
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
y=-2x x+y=8 3x-y=10 x+y=0 -2x+7x=24 3x-2y=4 2y-5x=12 2x-x=3x
x^5+3x^4y-5x^3y^2+4xy^4+12y^5
解;(y+17)/5-(3y-7)/4=-2 x/12-1=2x/15