me ajudem nessa questão
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a) (-2/3)² + (-2/3)+2/3
4/9-2/3+2/3
4/9
b)(2/1 -1/4) - (3/1 -1/2)
(2-1/4) - (3-1/2)
(8-1)/4 - (6-1)/2
7/4 - 5/2
(7-10)/4
-3/4
c) (3/4 - 5/6) ÷ (1/2+1/4)
(9-10)/12 ÷ (2+1)/4
-1/12 ÷ 1/4
-1/12 · 4/1
-4/12
-1/3
d) (1/2 -1/1) · (-2/1 - 3/4)
-1/2 · (-8-3)/4
-1/2 · -11/4
11/8
4/9-2/3+2/3
4/9
b)(2/1 -1/4) - (3/1 -1/2)
(2-1/4) - (3-1/2)
(8-1)/4 - (6-1)/2
7/4 - 5/2
(7-10)/4
-3/4
c) (3/4 - 5/6) ÷ (1/2+1/4)
(9-10)/12 ÷ (2+1)/4
-1/12 ÷ 1/4
-1/12 · 4/1
-4/12
-1/3
d) (1/2 -1/1) · (-2/1 - 3/4)
-1/2 · (-8-3)/4
-1/2 · -11/4
11/8
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