(-4x的n+1次方+12x的n次方-7x的n-1次方)÷(-5x)^(n-2)

问题描述:

(-4x的n+1次方+12x的n次方-7x的n-1次方)÷(-5x)^(n-2)
化简.

(-4x的n+1次方+12x的n次方-7x的n-1次方)÷(-5x)^(n-2)
=-4x的n+1次方÷(-5x)^(n-2)+12x的n次方÷(-5x)^(n-2)-7x的n-1次方÷(-5x)^(n-2)
=4/5x的n+1-n+2次方-12/5x的n-n+2次方+7/5x的n-1-n+2次方
=4/5x的3次方-12/5x的2次方+7/5x