第一题 (3²-2²)²+(4²-3²)²+(5²-4²)+(6²-5²)²
问题描述:
第一题 (3²-2²)²+(4²-3²)²+(5²-4²)+(6²-5²)²
( ²代表平方)
答
(3²-2²)²+(4²-3²)²+(5²-4²)+(6²-5²)²=[(3+2)(3-2)]^2+[(4+3)(4-3)]^2+[(5+4)(5-4)]^2+[(6+5)(6-5)]^2=5^2+7^2+9^2+11^2=25+49+81+121=276