如果兩個數(shù)相乘為0,則兩個數(shù)至少由一個為0.
再看這方程,X和(64*x-35-20*x^2)相乘為0,那么X=0或(64*x-35-20*x^2)=0.
解64*x-35-20*x^2=0,這個為一元二次方程,
x=[-b±(b^2-4ac)^(1/2)]/2a=[-64±(64^2-4*20*35)^(1/2)]/2*(-20)=(-64±36)/(-40),
解得X2=2.5,X3=0.7.
即:X1=0,X2=2.5,X3=0.7.
解方程 x*(64*x-35-20*x^2)=0
解方程 x*(64*x-35-20*x^2)=0
數(shù)學人氣:192 ℃時間:2020-10-02 03:28:17
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