求解方程(2X-10)*(X-10)*5=1500

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求解方程(2X-10)*(X-10)*5=1500求解方程(2X-10)*(X-10)*5=1500求解方程(2X-10)*(X-10)*5=1500(2X-10)*(X-10)*5=1500(2x^

求解方程(2X-10)*(X-10)*5=1500
求解方程(2X-10)*(X-10)*5=1500

求解方程(2X-10)*(X-10)*5=1500
(2X-10)*(X-10)*5=1500
(2x^2-20x-10X+100)*5=1500
(2x^2-30x+100)*5=1500
等式两边同时除以5得:
2x^2-30x+100=300
移项得:2x^2-30x-200=0
方程两边同时除以2得
x^2-15X-100=0
因式分解得:(x-20)(x-5)=0
所以 x1=20 x2=5

(2X-10)*(X-10)*5=1500
(2X-10)*(X-10)=300
2x^2-20x-10x+100=300
2x^2-30x-200=0
x^2-15x-100=0
(x-20)(x+5)=0
x=20 x=-5