(x-1)²+25=(x-5)²+4x²-2x+1+25=x²-10x+25+410x-2x=4-18x=3x=3÷8x=3/8x=8分之3
(x-1)²+25=(x-5)²+4x²+1-2x+25=x²+25-10x+48x=3x=3/8望采纳，谢谢
