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= 7,6 • ( 0,2 + 0,8 • 0,25 ) - 2,38 =
= 7,6 • ( 0,2 + 0,2 ) - 2,38 =
= 7,6 • 0,4 - 2,38 =
= 3,04 - 2,38 =
= 0,66
b) 2 1/3 • 4,2 - 2 2/3 • 1 7/9 =
= 7/3 • 42/10 - 8/3 • 16/9 =
= 7/1 • 14/10 - 128/27 =
= 98/10 - 128/27 =
= 9 8/10 - 4 20/27 =
= 9 4/5 - 4 20/27 =
= 9 108/135 - 4 100/135 =
= 5 8/135