数学,急急急
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5. (3-x)^2=16(2x+3)^2
(3-x)^2-16(2x+3)^2=0 [(3-x)+4(2x+3)][(3-x)-4(2x+3)]=0
(7x+15)(-9x-9)=0 x1=-15/7 x2=-1
6. (t-3)(t+4)=-12
t^2+4t-3t-12+12=0 t^2+t=0 t(t+1)=0 t1=0 t2= -1
7.(x-1)^2-3(x-1)-4=0
[(x-1)-4)][(x-1)+1]=0 (x-5)x=0 x1=0 x2=5
8. 2x^2+4x=x+2
2x^2+3x-2=0
x=[-3±根号(9+16)]/4
x=(-3±5)/4 x1=-2 x2=1/2
(3-x)^2-16(2x+3)^2=0 [(3-x)+4(2x+3)][(3-x)-4(2x+3)]=0
(7x+15)(-9x-9)=0 x1=-15/7 x2=-1
6. (t-3)(t+4)=-12
t^2+4t-3t-12+12=0 t^2+t=0 t(t+1)=0 t1=0 t2= -1
7.(x-1)^2-3(x-1)-4=0
[(x-1)-4)][(x-1)+1]=0 (x-5)x=0 x1=0 x2=5
8. 2x^2+4x=x+2
2x^2+3x-2=0
x=[-3±根号(9+16)]/4
x=(-3±5)/4 x1=-2 x2=1/2
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