2x+3y=19.5 5x+6y=45求x=多少 y=多少
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已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
2x+3y=19.5 5x+6y=45求x=多少 y=多少
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5X+Y=3 X+5Y=2 求x和y.5X+Y=3X+5Y=2求x和y.
1、(-y^3)^5/y^3/ y^2+2(-y)^102、(x-y)^7/(y-x)^6+(x+y)^3/(x+y)^23、已知X^a=5,x^b=3,求X^(3a-2b)的值
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
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√x(√x+2√y)=√y(6√x+5√y,求x-3√xy+2y/x+√xy-6y