解
√12-(2+√3)^0+1/(2+√3)
=2√3-1+(2-√3)/(4-3)
=2√3-1+2-√3
=√3+1
(1+√2)²(1+√3)²(1-√2)²(1-√3)²
=[(1+√2)(1-√2)]²[(1+√3)(1-√3)]²
=(1-2)²(1-3)²
=1×4
=4化简 a+2根号ab+b/a-b-(根号a/a+根号ab-根号b/b-根号ab)÷根号a/b+根号ab采纳后重新求助，还有，问题描述清楚点，什么地方应该括号，这个描述清楚，我看不懂你的题