先化简,再求值(1-2ab分之a²+b²)÷a²b+ab²分之a²-b²其中a=1,b=-3
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先化简,再求值(1-2ab分之a²+b²)÷a²b+ab²分之a²-b²其中a=1,b=-3
先化简,再求值(1-2ab分之a²+b²)÷a²b+ab²分之a²-b²其中a=1,b=-3
先化简,再求值(1-2ab分之a²+b²)÷a²b+ab²分之a²-b²其中a=1,b=-3
(1-2ab分之a²+b²)÷a²b+ab²分之a²-b²
=-(a²+b²-2ab)/2ab÷(a+b)(a-b)/ab(a+b)
=-(a-b)²/2÷(a-b)
=-(a-b)/2
=-(1+3)/2
=-2
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