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11. Efectuaţi:
a) 8√3a+12√3a + 3√3a-15√3a-25√3a;
9√2x+13√2x-18√2x+5√2x-10√√2.x;
b)
c) 4√5xy-7√5xy+14√5xy-9√5xy +2√5xy;
d) 5√6x²y-14√6x²y+19√6x²y-23√6x²y+8√6x²y.
(
20


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