若3x=2y,则4y^2/9x^2的值等于______
若3x=2y,则4y^2/9x^2的值等于______
若4x+3y+5=0,则3(8y-x)-5(x+6y-2)的值等于______.
若3x-4y=0,则x/y=______,(x-y)/y=______,(3x+2y)/(2x+3y)=_____.
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
已知正实数x、y满足x+2y=xy,则2x+y的最小值等于______.
若实数X Y满足y=2x+1,且x小于等于2y大于等于3,则y/x的取值范围是 ?
若2x+y=3,则y的4x次方乘y的2y次方等于多少?
已知2x+3y=-8 4x+y=66 则(x-y)^2-(3x+2y)^2的值为______
若(1+X)²+Y+1的绝对值=0 则4x-3y分之2x-y等于?
实数X,Y满足X大于等于Y大于等于1和2X平方-xy-5x+y+4=o,则x+y的值
已知x-y=5,(x+y)2=49,则x2+y2的值等于______.
若2x=3,4y=5,则2x-2y的值为______.