a)
(2,8-5) * (-9,38+9,36) = 0,044
1) 2,8 - 5 = - 2,2,
2) -9,38 + 9,36 = - 0,02,
3) -2,2 * (-0,02) = 0,044,
b)
(-5/9+14/15) : (-17/30) = -2/3
1) -5/9 + 14/15 = -25/45 + 42/45 = 17/45,
2) 17/45 : (-17/30) = - 17/45 * 30/17 = -30/45 = - 2/3
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Answers & Comments
a)
(2,8-5) * (-9,38+9,36) = 0,044
1) 2,8 - 5 = - 2,2,
2) -9,38 + 9,36 = - 0,02,
3) -2,2 * (-0,02) = 0,044,
b)
(-5/9+14/15) : (-17/30) = -2/3
1) -5/9 + 14/15 = -25/45 + 42/45 = 17/45,
2) 17/45 : (-17/30) = - 17/45 * 30/17 = -30/45 = - 2/3