(44-x)(20+5x)=1600

问题描述:

(44-x)(20+5x)=1600

(44-x)(20+5x)=1600
(44-x)(4+x)=320
176+40x-x^2=320
x^2-40x+144=0
(x-36)(x-4)=0
x=36或x=4

(44-x)(20+5x)=1600
880-20x+220x-5x^2=1600
5x^2-200x+720=0
x^2-40x+144=0
(x-36)(x-4)=0
x1=36,x2=4

1600=(20+5X)(44-X)
1600=-5x^2+200x+880
x^2-40x+144=0
(x-4)(x-36)=0
x=4,,x=36
没学过一元二次方程吗?

1600=(20+5X)(44-X)
1600=-5x^2+200x+880
x^2-40x+144=0
(x-4)(x-36)=0
x=4,,x=36

1600=(20+5X)(44-X)
1600=-5x^2+200x+880
x^2-40x+144=0
(x-4)(x-36)=0
x=4,x=36