(根号2-1)乘以(根号3-1)-1除以(根号2-1)+2除以(根号3-1)等于多少
问题描述:
(根号2-1)乘以(根号3-1)-1除以(根号2-1)+2除以(根号3-1)等于多少
答
(根号2-1)乘以(根号3-1)展开,得根号6-根号2-根号3+1
1除以(根号2-1)等于根号2+1
2除以(根号3-1)等于根号3+1
结果为根号6-2倍根号2+1
答
(根号2-1)乘以(根号3-1)-1除以(根号2-1)+2除以(根号3-1)
=(√2-1)(√3-1)-1/(√2+1)+2/(√3-1)
=(√2-1)(√3-1)-(√2-1)/[(√2+1)(√2-1)]+2(√3+1)/[(√3-1)(√3+1)]
=(√2-1)(√3-1)-(√2-1)+(√3+1)
=(√2-1)(√3-1-1)+(√3+1)
=(√2-1)(√3-2)+(√3+1)
=√6-2√2-√3+2+√3+1
=√6-2√2+3