Question

两道数学整式的乘法难题（1.）求证,n次方差：（a-b)(a^n-1 + a^n-2 +…+b^n）=a^n - b^n

Answer 1

(1)

展开就得证了

(2)

(5.25+7+2.6+2.75+7.4)*(1.1+(-1.2)+0.7)*(6+(-4)+11+(-5))