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∛(-27)=-3
√(5²-3²)=√(25-9)=√16=4
(1/2)⁻²⁰*4⁴⁰ = 2²⁰ * 2⁸⁰ = 2¹⁰⁰
2/(3√2-4)=2*(3√2+4)/(9*2-16)=2(3√2+4)/2=4+3√2
7/3+11/3:6=7/3+11/18=42/18+11/18=53/18
2*3³-3*2²=2*27-3*4=54-12=42
(3*5+12)/3=(15+12)/3=27:3=9
15³ : 5²=(3³*5³) : 5²=3³*5=27*5=135