1除以(1-根号2)等于多少/为什么?
1除以(1-根号2)等于多少/为什么?
1/(1-√2)
=1×(1+√2)/(1-√2)(1+√2) (利用平方差公式)
=(1+√2)/[1^2 -(√2)^2]
=(1+√2)/(-1)
=-(1+√2)
=-1-√2
根号2加1除以根号2减1,等于多少
(√2+1)/(√2-1)
=(√2+1)^2/[(√2-1)(√2+1)] (分式上下同时乘以√2+1)
=(2+2√2+1)/(2-1)
=3+2√2
(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
(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
1除以根号2等于多少
解答如下;
1除以根号2等于1乘以根号二分之一。
列式如下:
1÷√2=1X1/√2=1/√2
根号3减1除以根号3加1为什么等于2减根号3
(√3-1)/(√3+1)
=(√3-1)²/(√3+1)(√3-1) 分子分母同时乘以√3-1
=(3-2√3+1)/(3-1)
=(4-2√3)/2
=2-√3
根号2减1等于1除以1加跟2么?为什么.
1 / (1 + √2 ) = (√2 - 1 ) / [(√2 - 1 )(√2+ 1)] = (√2 - 1 ) / [(√2)^2 - 1^2] = (√2 - 1 ) / (2 - 1) = √2 - 1
麻烦采纳,谢谢!
根号45除以根号1/5乘以根号2又2/3等于多少
根号45除以根号1/5乘以根号2又2/3
=根号45乘以根号5乘以根号8/3
=根号(45乘以5乘以8/3)=根号600=10倍根号6
4 2倍根号2除以1 根号2等于多少
2√2
-
解:
(4+2√2)÷(1+√2)
=(4+2√2)×(√2-1)
=2√2(√2+1)×(√2-1)
=2√2(2-1)
=2√2