devilning
幼苗
共回答了22个问题采纳率:86.4% 举报
a/(a-√ab)-√b/(√a+√b)
=(√a)²/[√a(√a-√b)]-√b/(√a+√b)
=√a/(√a-√b)-√b/(√a+√b)
=√a(√a+√b)/[(√a-√b)(√a+√b)]-√b(√a-√b)/[(√a-√b)(√a+√b)]
=(a+√ab)/(a-b)-(√ab-b)/(a-b)
=(a+√ab-√ab+b)/(a-b)
=(a+b)/(a-b)
=(4+√3+4-√3)/[(4+√3)-(4-√3)]
=8/(4+√3-4+√3)
=8/(2√3)
=4/√3
=4√3/(√3*√3)
=4√3/3
1年前
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devilning
a/(a-√ab)-√b/(√a+√b) =(a+b)/(a-b) =(4+√3+4-√3)/[(4+√3)-(4-√3)] =8/(4+√3-4+√3) =8/(2√3) =4/√3 =4√3/(√3*√3) =4√3/3