二次根式加减乘除
问题描述:
二次根式加减乘除
①(2 √2-1)(2√2+1)②(2√x+√y)(√4x-√y)③(3√2+2√3)(3√2-2√3)④(3-√3)(1+1/√3)⑤(1+√2)²(1-√2)²
答
①(2 √2-1)(2√2+1)=(2√2)²-1=8-1=7②(2√x+√y)(√4x-√y)=(2√x)²-(√y)²=4x-y③(3√2+2√3)(3√2-2√3)=(3√2)²-(2√3)²=18-12=6④(3-√3)(1+1/√3)=1/3(3-√3)(3+√...