(√11+ 5 √7 +4√ 6)÷(7+√77+√66+√42)
问题描述:
(√11+ 5 √7 +4√ 6)÷(7+√77+√66+√42)
计算题
答
(√11+ 5 √7 +4√ 6)÷(7+√77+√66+√42)
=(5√11+ 5 √7 +4√ 6)÷(√7√7+√77+√66+√7√6)
=(√11+ 5 √7 +4√ 6)÷[√7(√7+√11)+√6(√11+√7)]
=(√11+√7 +4√7 +4√ 6)÷(√7+√11)(√6+√7)
=1/(√6+√7)+4/(√11+√7)
=√7-√6+√11-√7
=√11-√6