0.125^49x2^149+9^998x(-1/3)^1997 计算,急
计算:5x(x2-3x-1)-x2(1-x) 及急
计算:(1)x2+9xx2+3x+x2−9x2+6x+9
(x/x2-9)-(1/x2+6x+9)计算
初二数学 分式 计算1/(x-3)-6/(x2-9)-(x-1)/(6+2x)
化简计算~1/(x2-5x+6) - 1/(4x-x2-3) - 1/(3x-x2-2)
(x2+3x+9)/(x2-27)+(6x)/(9x-x2)-(x-1)/(6+2x)
计算极限Limx2-2x-3分之X2-9
计算x2-1/x2次方-2x+1÷x2次方+x/x-1
解方程:1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x
计算[x(3-4x)+2x2(x-1)]÷(-2x)
4x²-1/3x²-x·9x³-x/2x^4-x³计算 急
(x-1)(x+1)(x2+2x)计算