(10+X)(600-10X)=10000用分解因式法,

问题描述:

(10+X)(600-10X)=10000用分解因式法,

(10+X)(600-10X)=10000
6000+500x-10x²=10000
(6000+500x-10x²)÷10=10000÷10
600+50x-x²=1000
x²-50x+400=0
(x-10)(x-40)=0
x=10或x=40

(10+X)(600-10X)=10000
6000+500x-10x^2=10000
x^2-50x+400=0
(x-10)(x-40)=0
x=10 or x=40

(10+X)(600-10X)=10000
10(10+X)(60-X)=10000
(10+X)(60-X)=1000
600-10X+60X-X²-1000=0
-X²+50X-400=0
X²-50X+400=0
(X-10)(X-40)=0
X-10=0或X-40=0
所以
X1=10
X2=40