一元二次方程 (1)x∧2=4 (2)x∧2+6x+9=10 (3)(x-1)∧2=4 (4)9x∧2+6x+1=16 (5)(y-1)∧2-4=0
问题描述:
一元二次方程 (1)x∧2=4 (2)x∧2+6x+9=10 (3)(x-1)∧2=4 (4)9x∧2+6x+1=16 (5)(y-1)∧2-4=0
(6)2x-1=x∧2 (7)x∧2=5(8)4x∧2=9(1-x)∧2
答
(1)x∧2=4
x=2或x=-2
(2)x∧2+6x+9=10
(x+3)^2=10
x=-3+√10或x=-3-√10
(3)(x-1)∧2=4
x-1=2或x-1=-2
x=3或x=-1
(4)9x∧2+6x+1=16
(3x+1)^2=16
3x+1=4或3x+1=-4
x=1或x=-5/3
(5)(y-1)∧2-4=0
(y-1+2)(y-1-2)=0
y=-1或y=3
(6)2x-1=x∧2
x^2-2x+1=0
(x-1)^2=0
x=1
(7)x∧2=5
x=√5或x=-√5
(8)4x∧2=9(1-x)∧2
4x∧2-9(1-x)∧2=0
(2x+3(1-x))(2x-3(1-x))=0
(3-x)(5x-3)=0
x=3或x=3/5