数学题目~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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in fact
if √(x+y√z) can be written as √m+√n
then (√m+√n)²=x+y√z
then x=m+n
z*y*y/4=mn
as for the expression referred to,
m+n=53
mn=700
then m=28,n=25
√28+√25=5+2√7
then a=5,b=2,c=7
I BET THAT YOU ARE GOOD AT ENGLISH, aren`t you?
if √(x+y√z) can be written as √m+√n
then (√m+√n)²=x+y√z
then x=m+n
z*y*y/4=mn
as for the expression referred to,
m+n=53
mn=700
then m=28,n=25
√28+√25=5+2√7
then a=5,b=2,c=7
I BET THAT YOU ARE GOOD AT ENGLISH, aren`t you?
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53=25+28,20根号7=10根号28,根号下式子凑成完全平方,所以原式=根号(5+根号28)^2=5+根号28=5+2根号7
所以a=5,b=2,c=7
所以a=5,b=2,c=7
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