用因式分解法解下列二元一次方程①3X²+2X=0②X(3X+2)-6(3X+2)=0③9t-(t-1)²=0④(2X+3)²=(X-1)²
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![用因式分解法解下列二元一次方程①3X²+2X=0②X(3X+2)-6(3X+2)=0③9t-(t-1)²=0④(2X+3)²=(X-1)²](/uploads/image/z/469650-66-0.jpg?t=%E7%94%A8%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E6%B3%95%E8%A7%A3%E4%B8%8B%E5%88%97%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E2%91%A03X%26%23178%3B%2B2X%3D0%E2%91%A1X%283X%2B2%29-6%283X%2B2%29%3D0%E2%91%A29t-%28t-1%29%26%23178%3B%3D0%E2%91%A3%EF%BC%882X%2B3%EF%BC%89%26%23178%3B%3D%EF%BC%88X-1%EF%BC%89%26%23178%3B)
用因式分解法解下列二元一次方程①3X²+2X=0②X(3X+2)-6(3X+2)=0③9t-(t-1)²=0④(2X+3)²=(X-1)²
用因式分解法解下列二元一次方程①3X²+2X=0②X(3X+2)-6(3X+2)=0③9t-(t-1)²=0
④(2X+3)²=(X-1)²
用因式分解法解下列二元一次方程①3X²+2X=0②X(3X+2)-6(3X+2)=0③9t-(t-1)²=0④(2X+3)²=(X-1)²
①3X²+2X=0
x(3x+2)=0
x=0
或者3x+2=0
x=-2/3
②X(3X+2)-6(3X+2)=0
(3x+2)(x-6)=0
3x+2=0
x=-2/3
或者x-6=0
x=6
③9t²-(t-1)²=0
(3t+t-1)(3t-t+1)=0
(4t-1)(2t+1)=0
4t-1=0
t=1/4
或者2t+1=0
t=-1/2
④(2X+3)²=(X-1)²
(2x+3)²-(x-1)²=0
(2x+3+x-1)(2x+3-x+1)=0
(3x+2)(x+4)=0
3x+2=0
x=-2/3
x+4=0
x=-4
1、x(3x+2)=0,则x=0或x=-2/3
2、(x-6)(3x+2)=0,则x=6或x=-2/3
3、9t-(t^2-2t+1)=9t-t^2+2t-1=-t^2+11t-1=0
t^2-11t+1=0
用配方法:t^2-2*11/2t+(11/2)^2-(11/2)^2+1=0
(t-11/2)^2=117/4
t-11/2=正负(3根号13...
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1、x(3x+2)=0,则x=0或x=-2/3
2、(x-6)(3x+2)=0,则x=6或x=-2/3
3、9t-(t^2-2t+1)=9t-t^2+2t-1=-t^2+11t-1=0
t^2-11t+1=0
用配方法:t^2-2*11/2t+(11/2)^2-(11/2)^2+1=0
(t-11/2)^2=117/4
t-11/2=正负(3根号13)/2
t=(3根号13+11)/2或(11-3根号13)/2
4、4x^2+12x+9=x^2-2x+1
3x^2+14x+8=0
用十字交叉法:(3x+2)(x+4)=0
x=-2/3或-4
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