1. х= -(7 5/9) - (-5 1/6) = -3,5 2 (-14,35) - (-53,5) - (+21,3) - (16 3/20) = 3. (1 1/12) + (3,75) - (-х)=4,5

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вопрос

x = -(7 5/9) - (-5 1/6)
x = -8/9 + 31/6
x = -(8/9) + (31/6) * (3/3)
x = -(8/9) + 93/18
x = -(16/18) + 93/18
x = 77/18
x = 4 5/9

(-14.35) - (-53.5) - 21.3 - 16 3/20
= 39.15 - 21.3 - 21.3 - 16 3/20
= 39.15 - 58.6 - 16 3/20
= -19.45 - 16 3/20
= -19.45 - (19 15/20)
= -19.45 - 19.75
= -39.2

(1 1/12) + 3.75 - (-x) = 4.5
1 + 1/12 + 3.75 + x = 4.5
1 + 1/12 + 3.75 + x = 9/2
1 + 1/12 + 45/12 + x = 9/2
(1 + 1 + 45 + 12x)/12 = 9/2
(47 + 12x)/12 = 9/2
47 + 12x = 54
12x = 7
x = 7/12
x = 0.58333333333