Question

(3-x)(4-x)=48-20x+2x²怎么解

Answer 1

14-7x+x^2=48-20x+2x^2
2x^2-20x+48-x^2+7x-14=0
x^2-13x+34=0

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Answer 2

(3-x)(4-x)=48-20x+2x²
解凯碧中：12-7x+x²=48-20x+2x²
x²盯山-13x+36=0
（x-4）（慧漏x-9）=0
x-4=0 x-9=0
x1=4 x2=9

Answer 3

(3-x)(4-x)=48-20x+2x²
解简闭：拦冲裂12-7x+x²=48-20x+2x²
x²-13x+36=0
（判局x-9)(x-4)=0
x-9=0或x-4=0
x=9或x=4

Answer 4

(3-x)(4-x)=48-20x+2x²樱乎

x^2-7x+12=48-20x+2x^2
x^2-13x+36=0
(x-9)(x-4)=0
x=4或脊仔悉戚穗x=9

Answer 5

(3-x)(4-x)=48-20x+2x²
(x-3)(x-4)=48-20x+2x²汪坦
x²-7x+12=48-20x+2x²
x²-7x+12-48+20x-2x²=0
-x²+13x-36=0
x²-13x+36=0
（x-4）（滚轮x-9）=0
x-4=0或x-9=0
所以x1=4或大陵信x2=9。