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= 3 1/3 - (1,5 + 2,5) = 3 1/3 - 4 = -2/3
b) (7,3 -1/2 *0,8):0,03 = (7,3 - 0,5 × 0,8) : 0,03 = (7,3 - 0,4) : 0,3 = 6,9 : 0,3 =
= 69 : 3 = 23
d) 1,25 + (1,8: 1 1/2- 2/5) :(-1/3)² = 1,25 +(1,8 : 1,5 - 0,4) : 1/9 =
=1,25 + (18 : 12 - 0,4) : 1/9 = 1,25 + (1,2 - 0,4) × 9 =
= 1,25 + 0,8 × 9 = 1,25 + 7,2 = 8,45