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(1)
(√2+√3)^2 -√24
=(√2+√3)^2 -2√6
=5+2√6 -2√6
=5
(2)
√5+√45 -√(1/5)
=√5+3√5 +(1/5)√5
=(21/5)√5
(3)
2(x+y) -3x=2 (1)
x+y=7 (2)
from (1) and (2)
14-3x=2
3x=12
x=4
from (2)
x+y=7
4+y=7
y=3
(x,y)=(4,3)
(4)
x/2 +y/3 =2
3x+2y =12 (1)
4x-y=2 (2)
(1)+2(2)
11x=16
x=16/11
from (2)
4x-y =2
64/11-y = 2
y =42 /11
(x,y)=(16/11, 42/11)
(√2+√3)^2 -√24
=(√2+√3)^2 -2√6
=5+2√6 -2√6
=5
(2)
√5+√45 -√(1/5)
=√5+3√5 +(1/5)√5
=(21/5)√5
(3)
2(x+y) -3x=2 (1)
x+y=7 (2)
from (1) and (2)
14-3x=2
3x=12
x=4
from (2)
x+y=7
4+y=7
y=3
(x,y)=(4,3)
(4)
x/2 +y/3 =2
3x+2y =12 (1)
4x-y=2 (2)
(1)+2(2)
11x=16
x=16/11
from (2)
4x-y =2
64/11-y = 2
y =42 /11
(x,y)=(16/11, 42/11)
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