先化简,再求值:(a+b⼀b눀)대÷(a눀-b눀⼀b눀)눀÷(1⼀a-b)눀,其中a=-2,b=3.

2024-11-20 17:31:46
推荐回答(2个)
回答1:

[(a+b)/b²]³÷[(a²-b²)/b²]²÷[1/(a-b)]²
=(a+b)³/b^6÷[(a²-b²)²/b^4]÷1/(a-b)²
=(a+b)³/b^6÷[(a²-b²)²/b^4*(a-b)²]
=(a+b)³/b^6÷{[(a-b)(a+b)]²/b^4*(a-b)²}
=(a+b)³/b^6÷{(a-b)²(a+b)²/b^4*(a-b)²}
=(a+b)³/b^6÷{(a+b)²/b^4}
=(a+b)³/b^6*b^4/(a+b)²
=(a+b)/b²
=(-2+3)/3²
=1/9

回答2: