Ответы на вопрос:
A) -7 6/7 : (-9 3/7)= -55/7: (-66/7)=-55/7*(-7/66)= 5/6 b) -4 3/8 *4/21= -35/8*4/21= -5/6
1) r = 1.5 s = pi * 1.5^2 = 2.25*pi = 2.25 *3.14 = 7.065 см2 r = 4 s = pi* 4^2 = 16 *pi = 16*3.14 = 50,24 см2 r = 3 s = pi *3^2 = 9* pi = 9*3.14 = 28,26 см2 2) r^2 = 1.5^2 = 2.25 r^2 = 4^2 = 16 r^2 = 3^2 = 9 4) s / r^2 = 7.065 / 2.25 = 3.14 s / r^2 = 50.24 / 16 = 3.14 s / r^2 = 28.26 /9 = 3.14
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