19-200x+100x*x=0
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19-200x+100x*x=0
19-200x+100x*x=0
19-200x+100x*x=0
Δ=b²﹣4ac=(-200)²-4×19×100=32400
x=[-b±√﹙b²-4ac﹚]÷2a x₁=﹙200+180﹚÷2×100=1.9 x₂=﹙200-180)÷2×100=0.1
(10x-1)(10x-19)=0
x1=1/10 x2=19/10
(X+X)+(X-X)+(X*X)+(X/X)=100
19-200x+100x*x=0
100x^2-200x-19=0十字相乘
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