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5x﹣2x=3x 5ab﹣5ba=0 4x2y﹣5xy2=﹣x2y 3x2+2x2=5x2
f(1)<f(﹣3) f(3)>f(2) f(﹣2)>f(3) f(2)>f(0)
3x+2y= 5xy -y2-y2=0 7x+7x=14x2 7x-7x=0
x+x3=x4 x2·x5=x10 (x4)2=x8 x2+x2=x4(x≠0)
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P(X>=P(X≥=1-Ф( P(a≤X≤=Ф(-Ф( P(|X|≤=2Ф(-1 Ф(-=-Ф( P(X<=P(X≥=1-Ф(
3x+2x2=5x3 2a2b﹣a2b=1 ﹣ab﹣ab=0 ﹣x2y+yx2=0
P(X>=p(X≥=1-Ф( P(a≤X≤=Ф(-Ф( P(X=0)=0 P(-a<X<=Ф(-1 P(X==1