1/4a^2b-0.4ab^2-1/2a^2b+2/5ab^2
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1/4a^2b-0.4ab^2-1/2a^2b+2/5ab^21/4a^2b-0.4ab^2-1/2a^2b+2/5ab^21/4a^2b-0.4ab^2-1/2a^2b+2/5ab^2=1/4a^2
1/4a^2b-0.4ab^2-1/2a^2b+2/5ab^2
1/4a^2b-0.4ab^2-1/2a^2b+2/5ab^2
1/4a^2b-0.4ab^2-1/2a^2b+2/5ab^2
=1/4a^2b-2/5ab^2-1/2a^2b+2/5ab^2
=1/4a^2b-1/2a^2b-2/5ab^2+2/5ab^2
=-1/4a^2b
1/4a^2b^2{3ab(a+b)-5a(ab-b^2)}=?
(a+b-2ab)(a+b-2)+(1-ab)^2
(a-b+ab-a^2/a+b)乘以[a+1/a-b乘以(1+a/b)]
急……ab/(a+b-1)(a+b) + ab/(a+b)(a+b+1) + ab(a+b+1)(a+b+2) + …… + ab/(a+b+98)(a+b+99) + ab/(a+b+99)(a+b+100)
计算ab/(a+b-1)(a+b)+ab/(a+b)(a+b+1)+ab/(a+b+1)(a+b+2)+.+ab/(a+b+98)(a+b+99)+ab/(a+b+99)(a+b+100)
计算(a^3-4a^2b-a+4ab^2)/a(a-2b+1)
{ab-[3a²b-(4a²b+1/2ab)]-4a²b}+3a²b
-3/4ab+2/3a^2b+ab-a^2b-1/2ab-5/3a^2b
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已经a+b=1[(1/a)+1]*[(1/b)+1]=(a+b/a +a/a)(a+b/a +b/b)=(2a+b)(2b+a)/ab2a+b≥2*根号2ab2b+a≥2*根号2ba(2a+b)(2b+a)≥8ab所以(2a+b)(2b+a)/ab≥8,=(a+1)(b+1)/ab=ab+a+b+1/ab=ab+2/ab=2(a+b)/ab +1a+b≥2*根号ab(a+b)^2/4≥ab1/ab≥4a+b/ab≥4所
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如a-b=4,ab=1,则(2-ab+2a+5b)-(3ab+2b-2a)-(3a+4b-ab)=
若a-b=4,ab=1,求(-2ab+2a+3b)-(3ab+2b-2a)-(a+4b+ab)的值
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