10.8x-7.2x +10.8怎樣解方程

10.8x-7.2x +10.8怎樣解方程


10.8x-7.2x+10.8=幾？說清楚.
設10.8x-7.2x+10.8=b
3.6x =b-10.8
x =b/3.6-3



2x^2+3x+10=8x-1配方法解方程


2x^2+3x+10=8x-1
2x^2+3x+10-8x+1=0
2x^2-5x+11=0
Δ=b^2-4ac
=25-88
=-63＜0
∴
原方程無解



解方程2.8x-1.6=4.6


2.8x-1.6=4.6
2.8x=4.6+1.6=6.2
x=6.2/2.8=62/28=31/14

Elden Ring Premiere

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