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2014-09-29T22:05:43+03:00
A)√3(√27+4√3)=√3(3√3+4√3)=√3×7√3=7×3=21
b)(√3+2)²-√12=(√3²+2×√3×2+2²)-2√3=3+4√3+4-2√3=7+2√3
c)(√45-√5)²-20=(√45²-2×√45×√5+√5²)-20=(45-15+5)-20=35-20=15