用配方法分解因式x눀+3x-10

2024-11-25 18:21:38
推荐回答(5个)
回答1:

x²+3x-10
=(x+1.5)^2-12.25
=(x+1.5+3.5)(x+1.5-3.5)
=(x+5)(x-2)

回答2:

解:原式=(x+1.5)²-1.5²-10=(x+1.5)²-12.25=(x+1.5)²-3.5²=(x-2)(x+5)

回答3:

x²+3x-10=x²+2*3/2x+(3/2)^2-(3/2)^2-10=(x+3/2)^2-10-(3/2)^2
=(x+3/2)^2-31/40

回答4:

解:(x-2)(x+5)

回答5:

(x-2)(x+5)