9/14 + 0,5 - 23/21 : ...... (bentuk pecahan)

Diketahui :
- 9/14
- 0,5 = ½
- 23/21

Ditanya :
- 9/14 + 0,5 - 23/21 = .....?

Penyelesaian :

[tex] \frac{9}{14} + 0.5 - \frac{23}{21} \\ = \frac{9}{14} + \frac{1}{2} - \frac{23}{21} \\ = \frac{3 \times 9 + 21 - 2 \times 23}{42} \\ = \frac{27 + 21 - 46}{42} \\ = \frac{2}{42} \\ = \frac{1}{21} [/tex]

Maaf Kalau Salah

[tex] \frac{9}{14} + \frac{5}{10} - \frac{23}{21} \\ \\ = \frac{135}{210} + \frac{105}{210} - \frac{230}{210} \\ \\ = \frac{(135 + 105) - 230}{210} \\ \\ = \frac{240 - 230}{210} \\ \\ = \frac{10 \div 10}{210 \div 10} \\ \\ = \frac{1}{21} [/tex]