4,2-7\8 tolong di jawab ya

[tex]4.2 = \frac{21}{5} \\ \frac{7}{8} \\ \\ \frac{21}{5} - \frac{7}{8} \\ = \frac{8 \times 21 - 5 \times 7}{40} \\ = \frac{168 - 35}{40} \\ = \frac{133}{40} \\ = 3 \frac{13}{40} \\ = 3.325[/tex]
Maaf Kalau Salah

4,2 - 7 / 8 = 42/10 - 7/8
                =168/ 40 - 35/8 ( samakan penyebut ) 
                =133 /40
                =13,3 /4
                = 3,325

semoga bantu yaaa