X(80-2X)==750怎么解

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/17 04:54:42
X(80-2X)==750怎么解X(80-2X)==750怎么解X(80-2X)==750怎么解X(80-2X)=7502X²-80X+750=0X²-40X+375=0(x-15

X(80-2X)==750怎么解
X(80-2X)==750怎么解

X(80-2X)==750怎么解
X(80-2X)= 750
2X² -80X + 750 = 0
X² - 40X + 375 = 0
(x-15)(x-25) = 0
x = 15 或 x = 25

X(80-2X)==750
X(40-x)=375
x^2-40x+375=0
x=75或x=5