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()+2=()+5
(-2)^3×2^5
()÷()=2……5
sinθ-2cosθ=-2/5
-3÷(-2/5)÷(-1/4)
(-2)-(-5)+(-9)-(-7)
π/2<β<α<3π/4
ρ=√δx^2+δy^2
ρdρ/√a^2-ρ^2
()-2=()-3
(x²-2)²-4
∫-π/2 π/2
-8×-2-16÷-4
x²+2√2x+2=-4
(-2)^5÷2^4
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