一道初二填空若2x+y=3,则4x·2y=________.
若2x-y=2y-x=15,则x-y=________.
已知(3x-2y+1)²与4x-3y-3互为相反数,则x=________,y=________.
一道初二的填空题.若直线y=(m+1)x-2m-3经过点(1,2)则m=_____
若(4x-3)的平方+ 2y+1的绝对值=0,则x+2y=________.
求一道初二数学题解法若x+y+z=9,3x+y-z=15,x,y,z均为非负数,求5x+4y+2z的最大值与最小值.求解
初二化简求值题[(5x+2y)(3x+2y)+(x+2y)(x-2y)]/4x,其中x=2,y=3
一道希望杯的题整数x,y满足方程2xy + x + y =83,则x + y =_______或________.急用!
一道二元一次方程组!3(x+y)-4(x-y)=4,(x+y)/2+(x-y)/6=1
集合A={y|y=X2+2x+3} B={y|y=x+4/x} 则AUB=________
一道数学填空题:已知x²+y²+2x-6y+10=0,则2x²-3y+1=_______.
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
一道数学题:若x平方+y平方+2x-4y+5=0,先化简[(x/x-y)-1]/[y平方/x+y]