神马作文网数学5道题,急求详细过程!
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数学5道题,急求详细过程!
/>两边乘x,得x^2+22x-15=0,用求根公式求,x=-11+2√34,或x=-11-2√34
化简得,2*x^2+8x+6=0,即x^2+4x+3=0,(x+1)*(x+3)=0,x=-1或x=-3
化简得,3*x^2-2x-8=0,(x-2)*(3x+4)=0,x=2或x=-4/3
两边乘(x-2)(x+1),得2*(x+1)+4*(x-2)=3*(x-2)(x+1),化简得,3*x^2-9x=0,3x*(x-3)=0,x=0或x=3
两边乘4(x+1)(3x-1),得4x*(3x-1)-4(x+1)*(x+1)=(x+1)(3x-1),化简得,5*x^2-14x-3=0,(x-3)(5x+1)=0,x=3或x=-1/5
化简得,2*x^2+8x+6=0,即x^2+4x+3=0,(x+1)*(x+3)=0,x=-1或x=-3
化简得,3*x^2-2x-8=0,(x-2)*(3x+4)=0,x=2或x=-4/3
两边乘(x-2)(x+1),得2*(x+1)+4*(x-2)=3*(x-2)(x+1),化简得,3*x^2-9x=0,3x*(x-3)=0,x=0或x=3
两边乘4(x+1)(3x-1),得4x*(3x-1)-4(x+1)*(x+1)=(x+1)(3x-1),化简得,5*x^2-14x-3=0,(x-3)(5x+1)=0,x=3或x=-1/5