pakai cara kelas 6.....

no.1
= 1 1/2 + 2/5 - 3/10 × 1/9
= 3/2 + 2/5 - 3/10 × 1/9
= 3/2 + 2/5 - 3/90
= 3/2 + 2/5 - 1/30
= 45/30 + 12/30 - 1/30
= 56/30
= 28/15
= 1 13/15