Câu hỏi của Quoc Tran Anh Le

Question

Tính rồi so sánh kết quả của:a)$\frac{3}{4} + \left( {\frac{1}{2} - \frac{1}{3}} \right)$ và $\frac{3}{4} + \frac{1}{2} - \frac{1}{3};$          b)\(\frac{2}{3} - \left( {\frac{1}{2} + \frac{1}{3}...

Hà Quang Minh · Accepted Answer

a) $\frac{3}{4} + \left( {\frac{1}{2} - \frac{1}{3}} \right) = \frac{9}{{12}} + \left( {\frac{6}{{12}} - \frac{4}{{12}}} \right) = \frac{9}{{12}} + \frac{2}{{12}} = \frac{{11}}{{12}}$$\frac{3}{4} + \frac{1}{2} - \frac{1}{3} = \frac{9}{{12}} + \frac{6}{{12}} - \frac{4}{{12}} = \frac{{15}}{{12}} - \frac{4}{{12}} = \frac{{11}}{{12}}$Vậy $\frac{3}{4} + \left( {\frac{1}{2} - \frac{1}{3}} \right)$ = $\frac{3}{4} + \frac{1}{2} - \frac{1}{3}$    b)$\frac{2}{3} - \left( {\frac{1}{2} + \frac{1}{3}} \right) = \frac{4}{6} - \left( {\frac{3}{6} + \frac{2}{6}} \right) = \frac{4}{6} - \frac{5}{6} = \frac{{ - 1}}{6}$ $\frac{2}{3} - \frac{1}{2} - \frac{1}{3} = \frac{4}{6} - \frac{3}{6} - \frac{2}{6} = \frac{1}{6} - \frac{2}{6} = \frac{{ - 1}}{6}$Vậy $\frac{2}{3} - \left( {\frac{1}{2} + \frac{1}{3}} \right)$=$\frac{2}{3} - \frac{1}{2} - \frac{1}{3}$.Câu trả lời: a) $\frac{3}{4} + \left( {\frac{1}{2} - \frac{1}{3}} \right) = \frac{9}{{12}} + \left( {\frac{6}{{12}} - \frac{4}{{12}}} \right) = \frac{9}{{12}} + \frac{2}{{12}} = \frac{{11}}{{12}}$$\frac{3}{4} + \frac{1}{2} - \frac{1}{3} = \frac{9}{{12}} + \frac{6}{{12}} - \frac{4}{{12}} = \frac{{15}}{{12}} - \frac{4}{{12}} = \frac{{11}}{{12}}$Vậy $\frac{3}{4} + \left( {\frac{1}{2} - \frac{1}{3}} \right)$ = $\frac{3}{4} + \frac{1}{2} - \frac{1}{3}$    b)$\frac{2}{3} - \left( {\frac{1}{2} + \frac{1}{3}} \right) = \frac{4}{6} - \left( {\frac{3}{6} + \frac{2}{6}} \right) = \frac{4}{6} - \frac{5}{6} = \frac{{ - 1}}{6}$ $\frac{2}{3} - \frac{1}{2} - \frac{1}{3} = \frac{4}{6} - \frac{3}{6} - \frac{2}{6} = \frac{1}{6} - \frac{2}{6} = \frac{{ - 1}}{6}$Vậy $\frac{2}{3} - \left( {\frac{1}{2} + \frac{1}{3}} \right)$=$\frac{2}{3} - \frac{1}{2} - \frac{1}{3}$.

『Kuroba ム Tsuki Ryoo ︵²ᵏ⁷』 · Answer

`#3107``a)``3/4 + (1/2 - 1/3)``= 3/4 + (3/6 - 2/6)``= 3/4 + 1/6``= 11/12` `3/4 + 1/2 - 1/3``= 9/12 + 6/12 - 4/12``= (9 + 6 - 4)/12``= 11/12`Vì `11/12 = 11/12``=> 3/4 + (1/2 - 1/3) = 3/4 + 1/2 - 1/3``b)``2/3 - (1/2 + 1/3)``= 2/3 - (3/6 + 2/6)``= 2/3 - 5/6``= -1/6` `2/3 - 1/2 - 1/3``= 4/6 - 3/6 - 2/6``= (4 - 3 - 2)/6``= -1/6`Vì `-1/6 = -1/6``=> 2/3 - (1/2 + 1/3) = 2/3 - 1/2 - 1/3`Câu trả lời: `#3107``a)``3/4 + (1/2 - 1/3)``= 3/4 + (3/6 - 2/6)``= 3/4 + 1/6``= 11/12` `3/4 + 1/2 - 1/3``= 9/12 + 6/12 - 4/12``= (9 + 6 - 4)/12``= 11/12`Vì `11/12 = 11/12``=> 3/4 + (1/2 - 1/3) = 3/4 + 1/2 - 1/3``b)``2/3 - (1/2 + 1/3)``= 2/3 - (3/6 + 2/6)``= 2/3 - 5/6``= -1/6` `2/3 - 1/2 - 1/3``= 4/6 - 3/6 - 2/6``= (4 - 3 - 2)/6``= -1/6`Vì `-1/6 = -1/6``=> 2/3 - (1/2 + 1/3) = 2/3 - 1/2 - 1/3`

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