2减根号2的差除以根号2加根号18减4根号2分之1.

问题描述:

2减根号2的差除以根号2加根号18减4根号2分之1.

(2-√2)÷√2+√18-4√(1/2)
=2÷√2-√2÷√2+3√2-4×√2/2
=√2-1+3√2+2√2
=6√2-1