328-y/y x 100％=-18％

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328-y/yx100％=-18％328-y/yx100％=-18％328-y/yx100％=-18％328-y=-0.18y328=0.82yy=400

328-y/y x 100％=-18％
328-y/y x 100％=-18％

328-y/y x 100％=-18％
328-y=-0.18y
328=0.82y
y=400

328-y/y x 100％=-18％ x+y=100 2×16x=18y 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+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y) 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=? x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 100x+10y+1z=18x+18y+18x 求：x、y、z各是几. ：y' +y= cos x y= 微分方程y - 2y' + y = x 求y'=y/(y-x) y+y'-2y=2x 求 X Y公式X+Y=50Y/X=3X+Y=100Y/X=3求 x y...公式 D：y>=x,y y'/y=1/x If two even number x,y satisfy equation x×x+100=y×y,x x+x+x+x+y+y+y=56