a-b/2a+2b-a^2 +b^2 /b^2 -a^2.
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a-b/2a+2b-a^2+b^2/b^2-a^2.a-b/2a+2b-a^2+b^2/b^2-a^2.a-b/2a+2b-a^2+b^2/b^2-a^2.(a-b)/(2a+2b)-(a^2+b^2
a-b/2a+2b-a^2 +b^2 /b^2 -a^2.
a-b/2a+2b-a^2 +b^2 /b^2 -a^2.
a-b/2a+2b-a^2 +b^2 /b^2 -a^2.
(a-b)/(2a+2b)-(a^2 +b^2) /(b^2 -a^2)
=(a-b)/(2a+2b)+(a^2 +b^2) /( a^2-b^2)
=(a-b)/[2(a+b)]+(a^2 +b^2) /[(a-b)(a+b)]
=(a-b)^2/[2(a+b)(a-b)]+2(a^2 +b^2) /[2(a-b)(a+b)]
=[(a-b)^2+2(a^2 +b^2)] /[2(a-b)(a+b)]
=[a^2+b^2-2ab+2a^2 +2b^2] /[2(a-b)(a+b)]
=(3a^2+3b^2-2ab)/[2(a-b)(a+b)]
-2a(a+b)+b(a+b)
(a+2b)(a-2b)+(a-b)(a+b)-2(a-3b)(a-b)
5(a*a*b-3*a*a*b)-2*(a*a*b-7*a*b*b)
-a-b+2b^2/a+b
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|a+b|-|b-a|+|2b|化简哦!
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