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√2-√3÷√2+√3= a+b√6
kalikan pada ruas kiri √2-√3 / √2-√3
(√2-√3÷√2+√3 ) x (√2-√3 / √2-√3 ) = a+b√6
(√2-√3 )²/ ( 2-3 ) = a+b√6
-(2+3-2√6) = a+b√6
-5+2√6 = a + b√6
jadi a= -5 , b = 2
a+b = -5 + 2 = -3
so,
a + b√6 = -5 + 2√6
maka a = -5 dan b = 2
dg demikian nilai a + b = -5 + 2 = -3