8 3/10 - 4 6/8 - 2 1/4 berapa

samakan dulu penyebutnya
10 = 2*5
8 = 2*2*2
4 = 2*2

jadi penyebutnya adalah 2^3 * 5 = 8*5= 40

kemudian,
83/10 *40 = 83*4 = 332
46/8 *40 = 46*5 = 230
21/4 * 40= 21*10 = 210

jadi, 332 - 230 - 210 = - 108

[tex]8 \times \frac{3}{10} - 4 \times \frac{6}{8} - 2 \times \frac{1}{4} \\ \frac{83}{10} - \frac{38}{8} - \frac{9}{4} \\ \frac{332}{40} - \frac{190}{40} - \frac{90}{40} \\ = \frac{52}{40} = 1 \times \frac{12}{40} = 1 \times \frac{3}{10} [/tex]
Jawaban = 1 3/10