1) 10*40=400 (м)
2) 10*50=500 (м)
3)500-400=100 (м)
Ответ: 100 метров между домами мальчиков.
A) √3ctg(x/2) = 3
ctg(x/2) = 3/√3
ctg(x/2) = √3
x/2 = π/6 + πk, k€Z
x = π/12 + πk/2, k€Z.
b) sin(π/6 - 2x) = 0
-sin(2x - π/6) = 0
sin(2x - π/6) = 0
-π/6 + 2x = πk, k€Z
2x = π/6 + πk, k€Z
x = π/12 + πk/2, k€Z.
A^5*(a^5)^2= a^5*a^10=a^15; b^3b^7/b^2=b^10/b^2=b^8; 4a^3*(-3a^2b^5)=-12a^5b^5; 6b^2c^4/8bc^5=3b/4c.
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