a/a-3 - a+6/a²-3a+3/a二.(a/a-2-a/a+2)乘a²-4/a三.a-b+2b²/a+b四:x+2/x²-2x-x-1/x²-4x+4五:(1/x-y-1/x+y)乘x²-y²/xya/(a-3) - (a+6)/(a²-3a+3)/a二.(a/a-2 - a/a+2)乘a²-4/a三.(a-b+
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![a/a-3 - a+6/a²-3a+3/a二.(a/a-2-a/a+2)乘a²-4/a三.a-b+2b²/a+b四:x+2/x²-2x-x-1/x²-4x+4五:(1/x-y-1/x+y)乘x²-y²/xya/(a-3) - (a+6)/(a²-3a+3)/a二.(a/a-2 - a/a+2)乘a²-4/a三.(a-b+](/uploads/image/z/1122160-40-0.jpg?t=a%2Fa-3+-+a%2B6%2Fa%26%23178%3B-3a%2B3%2Fa%E4%BA%8C.%EF%BC%88a%2Fa-2-a%2Fa%2B2%29%E4%B9%98a%26%23178%3B-4%2Fa%E4%B8%89.a-b%2B2b%26%23178%3B%2Fa%2Bb%E5%9B%9B%EF%BC%9Ax%2B2%2Fx%26%23178%3B-2x-x-1%2Fx%26%23178%3B-4x%2B4%E4%BA%94%EF%BC%9A%EF%BC%881%2Fx-y-1%2Fx%2By%EF%BC%89%E4%B9%98x%26%23178%3B-y%26%23178%3B%2Fxya%2F%EF%BC%88a-3%EF%BC%89+-+%EF%BC%88a%2B6%EF%BC%89%2F%EF%BC%88a%26%23178%3B-3a%2B3%EF%BC%89%2Fa%E4%BA%8C.%EF%BC%88a%2Fa-2+-+a%2Fa%2B2%29%E4%B9%98a%26%23178%3B-4%2Fa%E4%B8%89.%EF%BC%88a-b%2B)
a/a-3 - a+6/a²-3a+3/a二.(a/a-2-a/a+2)乘a²-4/a三.a-b+2b²/a+b四:x+2/x²-2x-x-1/x²-4x+4五:(1/x-y-1/x+y)乘x²-y²/xya/(a-3) - (a+6)/(a²-3a+3)/a二.(a/a-2 - a/a+2)乘a²-4/a三.(a-b+
a/a-3 - a+6/a²-3a+3/a
二.(a/a-2-a/a+2)乘a²-4/a
三.a-b+2b²/a+b
四:x+2/x²-2x-x-1/x²-4x+4
五:(1/x-y-1/x+y)乘x²-y²/xy
a/(a-3) - (a+6)/(a²-3a+3)/a
二.(a/a-2 - a/a+2)乘a²-4/a
三.(a-b+2b²)/a+b
四:x+2(/x²-2x)- x-1/x²-4x+4
五:(1/x-y - 1/x+y)乘x²-y²/xy
a/a-3 - a+6/a²-3a+3/a二.(a/a-2-a/a+2)乘a²-4/a三.a-b+2b²/a+b四:x+2/x²-2x-x-1/x²-4x+4五:(1/x-y-1/x+y)乘x²-y²/xya/(a-3) - (a+6)/(a²-3a+3)/a二.(a/a-2 - a/a+2)乘a²-4/a三.(a-b+
分子或分母是式子的话可以用括号,这样会方便看