18x+29y=307,16x+28y=284
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18x+29y=307,16x+28y=284
18x+29y=307,16x+28y=284
18x+29y=307,16x+28y=284
两式相减2X+Y=23,在于16X+28Y=284结合,前者X28,再相减即得X=9 Y=5
解这些方程组 (1) 7x-2y=96 5x-3y=45 (2) 4x+2y=50 2x+3y=47 (3) 4x+2y=66 7x-3y=70(4) 11x+9y=49 13x-3y=17 (5) 2y-x=1 13x-8y=59 (6) 18x+29y=307 16x+28y=284
18x+29y=307,16x+28y=284
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
化简 x / y(x+y) - y / x(x+y) =
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
x+y=100 2×16x=18y
解二元一次方程组 {18x+29y=307}.① {16x+28y=284}.②
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
y=x(x
x+x+x+x+y+y+y=56
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x-y/x+y=(x-y)²/x²-y²(x≠y)
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