y=4/45x y=-4/15x+12解一下
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y=4/45x y=-4/15x+12解一下
y=4/45x y=-4/15x+12解一下
y=4/45x y=-4/15x+12解一下
y=4/45x y=-4/15x+12
所以
4/45x =-4/15x+12
两边同乘以45,得
4x=-12x=12×45
16x=12×45
4x=3×45
4x=135
x=135/4
y=4/45×135/4=3
x=4/5
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+1610(x-y)=3(x+y)+156(x+y)=4(2x-y)+16
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+1610(x-y)=3(x+y)+156(x+y)=4(2x-y)+16分开的。
解方程组:2(x +y)-3(x-y)=3;4(x+ y)+ 3(x-y)=15
解方程x+y+(x+y/2)=15 3x+5y+4(x+y/2)=62
解方程组:x+y/2+x-y/3=6 4(x+y)-5(x-y)=12
解方程组{2(x-y)/3 - x+y/4=-1 6(x+y)-41(x-y)=12
解方程组x-4y=-1x-4y=-12x+y=16
先化简再求值; 解方程组 x(x-y)-y(x+y)+2xy 其中x=2 ,y=-22.x[x-x(x-1)],其中x=-2解方程组4x+3y=12x-y=32.y+1=2x 4x-y=2 3.2x+2y=0 2x-y+24=0
y=4/45x y=-4/15x+12解一下
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
7x:4y,x:y=( ):(
(x-4y)(2x+y)=
5x-4y(y-x)=?
解方程(x+2)²+(x-4)(x+4)=(2x-1)(x+4)已知:x²+xy=12,xy+y²=15,求(x+y)²-(x+y)(x-y)的值
解方程组(1/X+Y)-(1/Y-X)=8/15,(5/X+Y)-5/Y=4
x+x+x+y=60 .x-y=4
解二元一次方程组:3(x+y)-4(x-y)=4,x+y/2+x-y/6+1x+y/2+x-y/6+1=1