2x² 4x 2=0 因式分解解方程
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2x²+x-1=0(2x-1)(x+1)=02x-1=0或x+1=0x1=1/2x2=-1
错了改一下(2x+5)²-6(2x+5)+9=0[(2x+5)-3]²=0(2x+2)²=02x+2=0x=-1
5x平方-2x-7=0(5x-7)(x+2)=0x1=7/5x2=-2
(4-x)(3x+6)=0-3(x-4)(x+2)=0x1=4,x2=-24y(y-1)=2y(y-1)4y(y-1)-2y(y-1)=02y(y-1)=0y1=0,y2=1
(x-2)(x-2)=4x-8(x-2)(x-2)=4(x-2)(x-2)((x-2)-4)=0(x-2)(x-6)=0所以:x-2=0即x=2或x-6=0即x=6即解为:x=2,x=6(3x-4)^
1/2x²+x+1/2=0x²+2x+1=0(x+1)²=0解得:x=-1
把(x-3)作为公因数提出来(x-3)*(x-3+4x)=0(x-3)*(5x-3)=0所以x1=3,x2=3/5=0.6
9(x-1)²-(x+2)²=09(x-1)²=(x+2)²3(x-1)=x+2或3(x-1)=-x-23x-3=x+2或3x-3=-x-22x=5或4x=1x
x(x-2)=0x=0,x=2再问:(y-5)(y+7)??
4x^2-25x+6=0(4x-1)(x-6)=0x1=1/4,x2=6
x^2+2x-4=0(x^2+2x+1)-5=0(x+1)^2-5=0(x+1+√5)(x+1-√5)=0x1=-1-√5x2=-1+√5
等于6x²+7x+2=02132(交叉相乘)(2x+1)(3x+2)=0x=-1/2x=-2/3
移项4x²-1=0(2x+1)(2x-1)=0x=-1/2,x=1/2
(3x+2)平方=4(x一3)平方(3x+2)²-4(x一3)²=0[(3x-2)+2(x-3)][(3x-2)-2(x-3)]=0(3x-2+2x-6)(3x-2-2x+6)=0
解题思路:先提取公因式x对等式的左边进行因式分解,即利用因式分解法解方解题过程:利用因式分解解方程:3x2-4x=0.解:由原方程,得x(3x-4)=0,∴x=0或3x-4=0,解得,x
(x-1)(2x+3)+x(1-x)=0(x-1)(2x+3)-x(x-1)=0(x-1)(2x+3-x)=0(x-1)(x+3)=0x-1=0x=1x+3=0x=-3
x(x²+4)=0x²+4>0,即不会等于0所以x=0
1/2x^2+5x-3=0x^2+10x-6=0x^2+10x+25=31(x+5)^2=31(x+5+根31)(x+5-根31)=0x=-5-根31或=-5+根31
应该是3(1/2-x)²-5(x-1/2)-2=0则3(x-1/2)²-5(x-1/2)-2=0[3(x-1/2)+1][(x-1/2)-2]=0(3x-1/2)(x-5/2)=0