先化简,再求值:(a+b/b²)³÷(a²-b²/b²)²÷(1/a-b)²,其中a=-2,b=3.
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先化简,再求值:(a+b/b²)³÷(a²-b²/b²)²÷(1/a-b)²,其中a=-2,b=3.
先化简,再求值:(a+b/b²)³÷(a²-b²/b²)²÷(1/a-b)²,其中a=-2,b=3.
先化简,再求值:(a+b/b²)³÷(a²-b²/b²)²÷(1/a-b)²,其中a=-2,b=3.
原式=[(a+b)/b²]³×[b²/(a+b)(a-b)]²×(a-b)²
=[(a+b)³/bˆ6]×(bˆ4)/(a+b)²(a-b)²×(a-b)²
=a+b/b²
把a=-2,b=3代入得1/9.