1.( -2/2a+3) + (3/3-2a)+[ 2a+15/ (2a-3)(2a+3)]2.[(a+2a^2-2a) - (a-1/a^2-4a+4)] ÷ 4-a/a
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1.( -2/2a+3) + (3/3-2a)+[ 2a+15/ (2a-3)(2a+3)]
2.[(a+2a^2-2a) - (a-1/a^2-4a+4)] ÷ 4-a/a
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1、
( -2/2a+3) + (3/3-2a)+[ 2a+15/ (2a-3)(2a+3)]
=[-2(2a-3)-3(2a+3)]/(2a+3)(2a-3)+[ 2a+15/ (2a-3)(2a+3)]
=(-4a+6-6a-9+2a+15)/(2a-3)(2a+3)
=(-8a+12)/(2a-3)(2a+3)]
=-4/(2a-3)
2、
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1、
( -2/2a+3) + (3/3-2a)+[ 2a+15/ (2a-3)(2a+3)]
=[-2(2a-3)-3(2a+3)]/(2a+3)(2a-3)+[ 2a+15/ (2a-3)(2a+3)]
=(-4a+6-6a-9+2a+15)/(2a-3)(2a+3)
=(-8a+12)/(2a-3)(2a+3)]
=-4/(2a-3)
2、
[ a+2/a(a-2) ] - (a-1/a^2-4a+4)] ÷ 4-a/a
=((a+2)(a-2)-a(a-1))/a(a-2)²÷4-a/a
=(a-4)/a(a-2)²÷4-a/a
=-1/(a-2)²
收起
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