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a)(5+√2)²=25+10√2+2=10√2+27
b)(1+2√2)=1+4√2+8=4√2+9
c)(√2+√3)=2+2√6+3=2√6+5
d)(x+y)²=x²+2xy+y²
e)(2x+3)²=4x²+12x+9
f)(x+√2)=x²+2x√2+2
g)(√3+b)=3+2b√3+b²